Did Jesus Pray “Father Forgive Them” from the Cross?

I recently received an important question about a highly significant textual variant in Luke 23:34, the one and only place in the NT where Jesus prays for those responsible for his death “Father, forgive them, they don’t know what they’re doing.”  The verse is not found in the other Gospels, and interestingly, it is also not found in some of the important manuscripts even of Luke.  And so the question: is it a verse that some scribes inserted into Luke?  Or is it a verse that other scribes de...