In 1 Cor. 2:9 Paul states: "Just as it is written: 'Eye has not seen and ear has not heard, neither have there been conceived in the heart of man the things that God has prepared for those who love him". (NWT)
This statement poses a textual problem in that there is no exactly corresponding text in the OT from which Paul might be quoting. The WT claims that here Paul "seems to be combining the thoughts of Isaiah 52:15, 64:4 and 65:17" (Insight, vol. 2, box page 366).
But, could it be that Paul was quoting from a source that was in later times to be expunged from the writings making up the official canon?
The WT rules out this possibility when, referring to the "Apocrypha", it states that "none of the Chistian Bible writers quoted from these books". (Insight, vol. 1, page 121).
But is this true? In the case of 1 Cor. 2:9 at least two possible candidates have been pointed to as the original source of Paul's quotation: the Gospel of Thomas and the Dialogue of the Saviour, which read as follows:
Gospel of Thomas 17: "Jesus said: 'I will give you what no eye has seen, what no ear has heard, what no hand has touched, what has not arisen in the human heart.'"
Dialogue of the Saviour (Nag Hammadi Codices III, 5 140,2-5): "The Lord said: 'You have asked me about a saying (...) which eye has not seen, nor have I have heard it, except from you ...'"
Besides, in his commentary to 1 Corinthians, Ambrosiaster (author of a commentary on Paul's Epistles) claims that the quote comes from the Apocalypse of Elijah ("Hoc est scriptum in Apocalypsi Heliae in apocryphis"). Origen and Euthalius also make similar claims, but I didn't manage to locate in the text of the Apocalypse the exact quotation these commentators refer to (can someone help please?).
Other examples of possible use of "apocryphal" sources by NT writers (that I'm aware of) are:
Hebrews 1:3 (compare Wisdom of Solomon 7:25-26)
Hebrews 11:35 (compare 2 Maccabees 7:1-15)
James 1:19 (compare Ecclesiasticus 5:11)
Judas vv. 14,15 (compare 1 Enoch 1:9)
If you know other similar instances, please post them here.
Behemot