In this dialogue, the Pharisees are attempting to trap Jesus regarding divorce

but Jesus turns their emphasis on legalities to the spiritual realm and God’s intention in marriage.

² Pharisees came up and in order to test [Jesus] asked, “Is it lawful for a man to divorce his wife?” ³He answered them, “What did Moses command you?” ⁴They said, “Moses allowed a man to write a certificate of divorce and to send her away.” ⁵And Jesus said to them, “Because of your hardness of heart he wrote you this commandment. ⁶But from the beginning of creation, ‘God made them male and female.’ ⁷‘Therefore a man shall leave his father and mother and hold fast to his wife, ⁸and they shall become one flesh.’ So they are no longer two but one flesh. ⁹What therefore God has joined together, let not man separate.”

¹⁰And in the house the disciples asked him again about this matter. ¹¹And he said to them, “Whoever divorces his wife and marries another commits adultery against her, ¹²and if she divorces her husband and marries another, she commits adultery.”

¹³And they were bringing children to him that he might touch them, and the disciples rebuked them. ¹⁴But when Jesus saw it, he was indignant and said to them, “Let the children come to me; do not hinder them, for to such belongs the kingdom of God. ¹⁵Truly, I say to you, whoever does not receive the kingdom of God like a child shall not enter it.” ¹⁶And he took them in his arms and blessed them, laying his hands on them.