Matthew 19:2-6

and large crowds followed Him, and He healed them there.

Some Pharisees came to Jesus, testing Him and asking, “Is it lawful for a man to divorce his wife for any reason at all?”

And He answered and said, “Have you not read that He who created them from the beginning made them male and female,

and said, ‘For this reason a man shall leave his father and his mother and be joined to his wife, and the two shall become one flesh’?

So they are no longer two, but one flesh. Therefore, what God has joined together, no person is to separate.”