Maleachi 2:11

There are two great ordinances which divine wisdom has instituted, the wretched profanation of both of which is complained of and sharply reproved in this chapter. I. The ordinance of the ministry, which is peculiar to the church, and is designed for the maintaining and keeping up of that; this was profaned by those who were themselves dignified with the honour of it and entrusted with the business of it. The priests profaned the holy things of God; this they are here charged with; their sin is aggravated, and they are severely threatened for it (Mal 2:1-9). II. The ordinance of marriage, which is common to the world of mankind, and was instituted for the maintaining and keeping up of that; this was profaned both by the priests and by the people, in marrying strangers (Mal 2:11, Mal 2:12), treating their wives unkindly (Mal 2:13), putting them away (Mal 2:16), and herein dealing treacherously (Mal 2:10, Mal 2:14, Mal 2:15). And that which was at the bottom of this and other instances of profaneness and downright atheism, thinking God altogether such a one as themselves, which was, in effect, to say, There is no God (Mal 2:17). And these reproofs to them are warnings to us.

2:11 Judah has been unfaithful (or treacherous), and a detestable thing has been done in Israel and in Jerusalem: Men were divorcing their wives for the economic advantage of intermarriage with non-Israelite women who worshiped idols. Through these marriages, Jewish men gained access to the merchant guilds and trading cartels already in place when the Israelites returned from Babylonia. Malachi equates this adultery with idolatry. Israelite history had shown that intermarriage with foreign women went hand in hand with worship of foreign gods. Loyalty was to be the hallmark of Israel’s covenant relationships, whether with God or with a marriage partner. Divorce treats with contempt the oneness of the marriage covenant (2:15; see Gen 2:24).