וַיְהִ֗י בְּעֵ֥ת תֵּ֛ת אֶת־מֵרַ֥ב בַּת־שָׁא֖וּל לְדָוִ֑ד וְהִ֧יא נִתְּנָ֛ה לְעַדְרִיאֵ֥ל הַמְּחֹלָתִ֖י לְאִשָּֽׁה׃
But it came to pass at the time when Merab Saul’s daughter should have been given to David, that she was given unto Adriel the Meholathite to wife.
Read midrashic interpretation of I Samuel 18:19: and classical rabbinic exegesis.