Charles Ellicott Commentary Matthew 19:5

"and said, For this cause shall a man leave his father and mother, and shall cleave to his wife; and the two shall become one flesh?" — Matthew 19:5 (ASV)

And said, For this cause — In Genesis 2:24 the words appear as spoken by Adam; but words so uttered, prompted by the Holy Spirit and stamped with divine sanction, could well be regarded as an oracle from God, the expression of a law of His appointment.