Matthew 23:30

and you say 'If we had been living in the days of our fathers, we would not have joined them in shedding the blood of the prophets.'

Matthew 21:35-36

but the vinedressers took his servants and flogged one, killed another, and stoned a third.

Matthew 23:34-35

This is why I will send you prophets, wise men, and scribes, some of whom you will kill and crucify, some of whom you will flog in your synagogues and persecute from town to town;

Treasury of Scripture Knowledge

Summary

And say, If we had been in the days of our fathers, we would not have been partakers with them in the blood of the prophets.

Bible References

The blood

Matthew 23:34
This is why I will send you prophets, wise men, and scribes, some of whom you will kill and crucify, some of whom you will flog in your synagogues and persecute from town to town;
Matthew 21:35
but the vinedressers took his servants and flogged one, killed another, and stoned a third.