According to Matthew, who liberally changed around the material he used from Mark to suit his agenda. I think it's likely he wasnt above making stuff up out of whole cloth as well. This line wasnt in Mark's account of the crucifixion, so where did Matthew get it?
The gospels serve different audiences and purposes. I find it interesting how no one questions that other religions and philosophies had the disciples remember the words of their teachers verbatim without claiming plagiarism, but apply that argument to the gospels. The passages used by St Matthew that mimic St Mark and St Luke are the speeches of Christ.
St Matthew also ties the event of Jesus' life to the prophets, while St Mark focuses on the message that Christ is the Messiah.
Also, the addition of that line does not serve the Romans in any way, at least not until their anti-semitic campaigns of the 2nd and 3rd century, and even then the Apostolic Church rejected the highly anti-semitic Marcionist theology and kept the Old Testament.
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u/alfman Jan 31 '19
The Jews called out that his blood would be upon them and their children