en_tn_condensed/mat/19/08.md

For your hardness of heart

"Because of your stubbornness" or "Because you are stubborn"

your hardness ... allowed you ... your wives

Jesus is speaking to the Pharisees, but Moses gave this command many years earlier to their ancestors. Moses's command applied to all Jewish men in general.

from the beginning

Here "beginning" refers to when God first created man and woman.