Maleakhi 2:14

2:14 Yet you ask, “Why?” The Lord is testifying against you on behalf of the wife you married when you were young, ¹  to whom you have become unfaithful even though she is your companion and wife by law. ² 

Maleakhi 3:14

3:14 You have said, ‘It is useless to serve God. How have we been helped ³  by keeping his requirements and going about like mourners before the Lord who rules over all? ⁴ 

[2:14]  ¹ tn Heb “the Lord is a witness between you and [between] the wife of your youth.”

[2:14]  ² sn Though there is no explicit reference to marriage vows in the OT (but see Job 7:13; Prov 2:17; Ezek 16:8), the term law (Heb “covenant”) here asserts that such vows or agreements must have existed. References to divorce documents (e.g., Deut 24:1-3; Jer 3:8) also presuppose the existence of marriage documents.

[3:14]  ³ tn Heb “What [is the] profit”; NIV “What did we gain.”

[3:14]  ⁴ sn The people’s public display of self-effacing piety has gone unrewarded by the Lord. The reason, of course, is that it was blatantly hypocritical.