Many years ago, when my faith was yet “new,” I was shocked to learn that there are numerous quotes in Scripture (and/or allusions) from pagan and other secular writings. I embarked on a study at that time into the context in which these secular sources are cited in the Holy Writings, and I reproduce the findings thereof here.
References to Historical Records
Numbers 21:14 refers to the Book of the Wars of YHWH, an apparently ancient work (pre-15th Century BCE) no longer available and not referenced in any other extant work but the Torah. What seems to be a community conduct code is mentioned at 1 Samuel 10:25, i.e. Book of Statutes (aka 3 Samuel).
There is also reference to two royal annals which have disappeared from modern access: Chronicles of the Kings of Israel and Chronicles of the Kings of Judah (1 Kings 14:19; 14:29; 16:20; & often in Kings). These seem to be records from the time of Jeroboam and Rehoboam. The Annals of King David (1 Chronicles 27:24) and the Acts of Solomon (1 Kings 11:41) are also cited lost works.
2 Chronicles speaks of the Book of Shemaiah and The Annals of the Prophet Iddo (9:29; 12:15; 13:22), neither of these currently extant.
There are several references in Scripture to works which may be unknown, or may actually be ancient monikers for portions of the Scriptures themselves.
- Acts of Samuel the Seer, possibly 1 & 2 Samuel (ref. at 1 Chron 29:29)
- Prophecy of Ahijah, possibly 1 Kings 14:2–18 (ref. at 2 Chron 9:29)
- Book of Jehu, possibly 1 Kings 16:1–7 (ref. at 2 Chron 20:34)
- Vision of Isaiah, possibly the canonical Book of Isaiah (2 Chron 32:32)
Another uncertain reference is found in Matthew 5:43, where Messiah Yeshua seems to quote some work (certainly not, as we tend to understand its meaning, a reflection of Scripture nor Talmud) which advocated an attitude of “hate your enemy.” Hatred for one’s enemies, per the usual definition, is a precept foreign to Pharisaic Judaism (under the umbrella of which Messianic Judaism falls, per Yeshua in Matthew 23:1-3), adherents of which mourn the death of enemies (Pessikta K 189a; Job 31:29-30) and forbids seeking revenge (Leviticus 19:18; Proverbs 20:22; 24:29) or even “abhoring” (hating) one’s enemy (Deuteronomy 23:8).
Thou shalt not abhor an Edomite, for he is thy brother; thou shalt not abhor an Egyptian, because thou wast a stranger in his land” (JPS 1917).
Many have insisted that this is a reference to DSM 1:3f from the Dead Sea Scrolls, considered by most to be an Essene product, which indicates that members should properly harbor hatred toward all enemies of that community, i.e “sons of darkness.”
Rabbi and scholar Pinchas Lapide, however, questions whether that document is the true source behind the reference. He suggests, “In Jesus’ time the Qumran sect [Yachad] was too young, too distant, and too small to be presumed to have been a norm — or antinorm — in Galilee.”  It is becoming more widely recognized among scholars that the alleged Qumran connection is untenable. Lapide suggests, instead, a possible connection with Deuteronomy 21:15, where “hated” simply means “loved less than” (ibid., 86). It may possibly connect to Malachi 1:2-3 as well, where the verb “hated” is better rendered “have not enter into covenant with.”
There was a popular genre of fiction en vogue from about the 2nd Century BCE to about the 8th Century CE (though waning the last few centuries of that epoch) called pseudepigrapha. characterized by the attribution of the name of a well-known figure from the past to one’s work in order to explore what that person might have said on a subject he or she had never addressed.  Pseudepigraphy (false attribution) was a literary device that was well understood by the audience, and in most cases no deception was intended by it (though modern audiences can tend to be confused by the device). Some pseudepigraphal works, however, clearly overlap with the “propaganda” genre and are intended to deceive, e.g. the agenda-driven Letter of Aristeas (written to spread the fabricated “story” of the creation of the Septuagint).
Popular examples of this fictional genre of writing include the Book of Jasher (referenced at Joshua 10:13 and 2 Samuel 1:18)  and the Book of Enoch (i.e. 1 Enoch, alluded to in 2 Peter and Jude). Both of these contain passages that blatantly contradict Scripture (e.g. 1 Enoch 10:1 reporting that Enoch was instructed to go speak to Noach when he had been raptured 69 years before Noach’s birth). But, the original audience knew they were reading fiction and thus did not hold it to the standard of Scripture, just as we do not expect theological inerrancy out of a religious-themed novel like The Chosen (Chaim Potok) or The Hobbit (J. R. R. Tolkein). Likewise, no one reads Jewish author Yudl Rosenberg’s novel and comes away believing “golems” are anything but fictitious creatures invented for entertainment. 
Other Pseudepigraphical works referenced in Scripture include Assumption of Moses (Jude 9), Life of Adam and Eve (2 Corinthians 11:14; 12:2), and Martyrdom of Isaiah (Hebrews 11:37), as well as (probably) the Book of Gad the Seer (1 Chronicles 29:29).
Writings from Pagan Cultures
The previously mentioned works are at least Jewish, but what do we do with quotations from or allusion to works that are clearly pagan? Esther and Nehemiah make mention of a Persian document titled the Chronicles of King Ahasueras (Esther 2:23; 6:1; 10:2; Nehemiah 12:23).
More problematic is that Sha’ul (Paul) quotes from Menander’s Thais (1 Corinthians 15:33 — “Bad company corrupts good character”), Epimenides’s De Oraculis (Titus 1:12–13), and Aratus’s Phaenomena (Acts 17:28) — all three of which are pagan penmen. Menander was a comedy-playwright (3rd-4th Century BCE), Aratus was a poet and astrologer (3rd-4th Century BCE), and Epimenides (referenced as “the Cretans’ own prophet”) was, besides being a pagan seer, also a reknowned Greek philosopher (6th-7th Century BCE). Aratus wrote the line “For in you we live and move and have our being” for the chief god of the Greek pantheon, which Paul acknowledges with the qualifier, “some of your poets among you have said….”
It is not necessarily an endorsement for canonicity for a Biblical writer to reference a non-canonical work. It is more an indictment of the audience missing an important truth that “even this secular work recognizes” (the thrust of the citation). We would certainly not claim that Paul is declaring the writings of Epimenides or Menander to be Scripture by quoting or alluding to them any more than we would say that Pastor Joe quoting from C. S. Lewis is declaring The Chronicles of Narnia to be Scripture. There is an illustrative use of these texts that we should be careful not to mistake for wholesale endorsement or advocacy of canonization. The important thing to remember is that these works are not being endorsed wholesale by the authors and Author of Scripture, and thus should not be used a lens for interpreting Scripture. While they may, perhaps, provide historical-cultural background, they are not (for good reasons) inspired Scripture and should not be exalted as such.
Notes and References
- Pinchas E. Lapide, “And I Say to You,” (Orbis Books, 1986; online: http://www.nyu.edu/classes/gmoran/LAPIDE.pdf), 85.
- Michael E. Stone, “The Apocrypha and Pseudepigrapha,” Jewish Virtual Library (online: www.jewishvirtuallibrary.org/jsource/Judaism/apocrypha.html); S.v. ψευδεπίγραφος, Liddell & Scott Greek-English Lexicon(online: http://perseus.uchicago.edu/cgi-bin/philologic/getobject.pl?c.83:2:17.LSJ). Nota bene: Though some parts of Stone’s article are flawed, his definition of pseudepigrapha (comprising the 3rd paragraph) is accurate and in agreement with Liddell & Scott (as indicated here) and with responsible 2nd Temple scholarship in general.
- A criticism was made recently of the present author that “to call any Jewish book fiction is anti-Semitic.” I would answer that charge with a question. Does this mean that no Jew is ever permitted to write a work of fiction, or that everything any Jew ever writes (Sigmund Freud, Woody Allen, etc.) must be regarded as inerrant or else the person recognizing that, for example, Yudl Rosenberg’s “golems” are fictitious is a Nazi? If a Jew writes a fiction piece, intending it to be fiction, it is not “anti-Semitic” to place it in the genre the author intended it to be under, and it does not “weaken Judaism” for a Jew to write in a fiction genre.