Keluaran 20:14

20:14 “You shall not commit adultery. ¹ 

Maleakhi 2:15

2:15 No one who has even a small portion of the Spirit in him does this. ²  What did our ancestor ³  do when seeking a child from God? Be attentive, then, to your own spirit, for one should not be disloyal to the wife he took in his youth. ⁴ 

[20:14]  ¹ sn This is a sin against the marriage of a fellow citizen – it destroys the home. The Law distinguished between adultery (which had a death penalty) and sexual contact with a young woman (which carried a monetary fine and usually marriage if the father was willing). So it distinguished fornication and adultery. Both were sins, but the significance of each was different. In the ancient world this sin is often referred to as “the great sin.”

[2:15]  ² tn Heb “and not one has done, and a remnant of the spirit to him.” The very elliptical nature of the statement suggests it is proverbial. The present translation represents an attempt to clarify the meaning of the statement (cf. NASB).

[2:15]  ³ tn Heb “the one.” This is an oblique reference to Abraham who sought to obtain God’s blessing by circumventing God’s own plan for him by taking Hagar as wife (Gen 16:1-6). The result of this kind of intermarriage was, of course, disastrous (Gen 16:11-12).

[2:15]  ⁴ sn The wife he took in his youth probably refers to the first wife one married (cf. NCV “the wife you married when you were young”).