Passover is most certainly given to us by Jesus before He became a man. But Passover is all about Jesus, the Messiah. How can a person observe the Passover commandment and reject the Christ? You can’t. So the Jews had created their own Passover which pointed to a different Messiah, one that does not exist.
You see. So even though they may have claimed to follow this Feast, they had corrupted it so they weren’t really keeping it were they. Jesus, however, did observe this Feast as well as the rest of the Feasts He created before becoming a man.
I am not good at getting my point across sometimes. Do you understand the point I’m trying to make?