A.T. Robertson Commentary Ephesians 5:31

"For this cause shall a man leave his father and mother, and shall cleave to his wife; and the two shall become one flesh." — Ephesians 5:31 (ASV)

For this cause (αντ τουτου). "Answering to this" = ενεκεν τουτου of Ge 2:24, in the sense of αντ seen in ανθ' ων (Luke 12:3). This whole verse is a practical quotation and application of the language to Paul's argument here. In Mt 19:5 Jesus quotes Ge 2:24. It seems absurd to make Paul mean Christ here by ανθρωπος (man) as some commentators do.