Matthew 19:5

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

Note Genesis 2:24 (see also LXX)

BSB · Berean Standard Bible
And said, For this cause shall a man leave father and mother, and shall cleave to his wife: and they twain shall be one flesh?
KJV · King James Version
and said, ‘For this cause a man shall leave his father and mother, and shall be joined to his wife; and the two shall become one flesh’?
WEB · World English Bible
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?
ASV · American Standard Version

Related passages

From the Treasury of Scripture Knowledge, grouped by the word they explain.

said
Genesis 2:21–24; Psalm 45:10; Mark 10:5–9; Ephesians 5:31
Matthew 19:5
cleave.[Proskollao ,] "shall be cemented to his wife," as the Hebrew davak implies; a beautiful metaphor, forcibly intimating that nothing but death can separate them.
Genesis 34:3; Deuteronomy 4:4; Deuteronomy 10:20; Deuteronomy 11:22; 1 Samuel 18:1; 2 Samuel 1:26; 1 Kings 11:2; Psalm 63:8; Romans 12:9
and they
1 Corinthians 6:16; 1 Corinthians 7:2, 4