Matthew 19:4-6
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Concerning Divorce
4And he answered and said, Have ye not read, that he who made [them] from the beginning made them male and female, 5and 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? 6So that they are no more two, but one flesh. What therefore God hath joined together, let not man put asunder.
Matthew 19:4-6 (ASV)