וְשָׁא֗וּל נָתַ֛ן אֶת־מִיכַ֥ל בִּתּ֖וֹ אֵ֣שֶׁת דָּוִ֑ד לְפַלְטִ֥י בֶן־לַ֖יִשׁ אֲשֶׁ֥ר מִגַּלִּֽים׃
Now Saul had given Michal his daughter, David’s wife, to Palti the son of Laish, who was of Gallim.
Tosefta Sotah
Similarly, you can say (2 Sam. 21:8), "And the five sons of Michal daughter of Saul that she bore to Adriel [son of Barzilai] the Mecholatite, etc." Here we find that [Saul] gave Michal to Adriel the Mecholatite. But did he not give her, rather, to Palti son of Laish from Gallim? For it says (1 Sam. 25:44), "And Saul gave Michal his daughter, the wife of David, to Palti son of Laish." Rather, the marriage of Michal is juxtaposed to the marriage of Merav (see 1 Sam. 18:19). Just as the marriage of Merav [was consummated] through sin, so too the marriage of Michal to Palti ben Laish [was consummated] through sin.