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If Luke testifies to Peter and Paul, who testifies to Luke? Who told you that John is the author of the Gospel bearing his name, or Matthew, or Mark?

Paul does in 1 Timothy , He quotes from the gospel of Luke

1Ti 5:18For the scripture saith, Thou shalt not muzzle the ox that treadeth out the corn. And, The labourer [is] worthy of his reward.

Luk 10:7 And in the same house remain, eating and drinking such things as they give: for the labourer is worthy of his hire. Go not from house to house.

The greek word for reward is the same as hire

Um, no. Both of these (and 1 Cor 9:9) are refering to the Old Testament.

Deuteronomy 25:4 Thou shalt not muzzle the ox when he treadeth out the corn.

Paul is not quoting Luke, he is quoting the OT.

1Ti 5:18For the scripture saith, Thou shalt not muzzle the ox that treadeth out the corn. And, The labourer [is] worthy of his reward.

Luk 10:7 And in the same house remain, eating and drinking such things as they give: for the labourer is worthy of his hire. Go not from house to house.

Dave I am well aware that the section about the ox is Paul quoting the OT ..That is not the point.

Paul quotes Luke in that a laborer is worthy of his hire

So Paul quotes both the OT and Jesus through Luke