In the 1 Co 5:7 passage, Paul addresses both the unleavened bread and the Passover Lamb.
This all, of course, also ties into Communion...bread/cup flesh/blood.
But, this thread doesn’t seem headed toward a discussion of Christian truth. :>)
Everything leads me there, lol. I was thinking also of the Psalm that says “When he struck the rock, water gushed out and streams flowed abundantly” and the NT declaring that “the Rock was Christ”! I can only imagine the endless light bulbs going off inside a Jewish mind when they believe in Christ (and the tears of joy).