Commentary for I Samuel 18:27

וַיָּ֨קָם דָּוִ֜ד וַיֵּ֣לֶךְ ׀ ה֣וּא וַאֲנָשָׁ֗יו וַיַּ֣ךְ בַּפְּלִשְׁתִּים֮ מָאתַ֣יִם אִישׁ֒ וַיָּבֵ֤א דָוִד֙ אֶת־עָרְלֹ֣תֵיהֶ֔ם וַיְמַלְא֣וּם לַמֶּ֔לֶךְ לְהִתְחַתֵּ֖ן בַּמֶּ֑לֶךְ וַיִּתֶּן־ל֥וֹ שָׁא֛וּל אֶת־מִיכַ֥ל בִּתּ֖וֹ לְאִשָּֽׁה׃ (ס)

and David arose and went, he and his men, and slew of the Philistines two hundred men; and David brought their foreskins, and they gave them in full number to the king, that he might be the king’s son-in-law. And Saul gave him Michal his daughter to wife.

Rashi on I Samuel