???
What?!  The Jews did not assasinate Jesus.  Mankinds' sin did.  I don't have the time to list the many scriptures -  actually, the whole Bible explains it pretty clearly.  Jesus knew He was going to die, even before He left His Heavenly throne - it was all a part of the God's plan of redemption, not man's  scheming and plotting. Jesus willingly laid down His life.   To cleanse all of our sin was the reason that His Holy blood had to be shed.  Forgive the Jews for what?  Actually, we need to forgive each other for our sins that nailed Him to the cross.
I pray that you get a truthful revelation of this brother.
LL