malachi 2:11 Judah hath dealt treacherously, and an abomination is committed in Israel and in Jerusalem; for Judah hath profaned the holiness of the LORD which he loved, and hath married the daughter of a strange god. - Free Bible Online

      11. dealt treacherously--namely, in respect to the Jewish wives who were put away (Mal 2:14; also Mal 2:10, 15, 16).
      profaned the holiness of . . . Lord--by ill-treating the Israelites (namely, the wives), who were set apart as a people holy unto the Lord: "the holy seed" (Ezr 9:2; compare Jer 2:3). Or, "the holiness of the Lord" means His holy ordinance and covenant (De 7:3). But "which He loved," seems to refer to the holy people, Israel, whom God so gratuitously loved (Mal 1:2), without merit on their part (Ps 47:4).
      married, &c.-- (Ezr 9:1, 2; 10:2; Ne 13:23, &c.).
      daughter of a strange god--women worshipping idols: as the worshipper in Scripture is regarded in the relation of a child to a father (Jer 2:27).

JFB.