1 Corinthians 7:6

6 But I speak this by permission, and not of commandment.

Ver. 6. And not of commandment ] Among the Jews marriage was not held a thing indifferent, or at their own liberty to choose or refuse, but a binding command. (Targum on Gen 1:28 ) Hereto Paul seems in this verse to allude. In this day every Jew is bound to marry about 18 years of age, or before 20; else he is accounted as one that liveth in sin.