Judging from his authentic letters, Paul seems to have known little about – or thought it unnecessary to mention – many details about Jesus’ life and teachings. Direct quotations were very few. But in Acts 20:35, the author reported that Paul said to the ‘elders of the church’ of Ephesus:
"In everything I showed you that by working hard in this manner you must help the weak and remember the words of the Lord Jesus, that He Himself said, 'It is more blessed to give than to receive.'" (NASB)
Commentators often note that these reported words of Jesus do not appear in our canonical gospels. Are there any non-canonical sources that include these words, attributed either to Jesus or someone else? Do critical scholars consider this an authentic Jesus saying in Acts? Does it have similarity to anything else in Paul or 'Luke'?