וַיֹּ֨אמֶר שָׁא֜וּל אֶל־דָּוִ֗ד הִנֵּה֩ בִתִּ֨י הַגְּדוֹלָ֤ה מֵרַב֙ אֹתָהּ֙ אֶתֶּן־לְךָ֣ לְאִשָּׁ֔ה אַ֚ךְ הֱיֵה־לִּ֣י לְבֶן־חַ֔יִל וְהִלָּחֵ֖ם מִלְחֲמ֣וֹת יְהוָ֑ה וְשָׁא֣וּל אָמַ֗ר אַל־תְּהִ֤י יָדִי֙ בּ֔וֹ וּתְהִי־ב֖וֹ יַד־פְּלִשְׁתִּֽים׃ (ס)
And Saul said to David: ‘Behold my elder daughter Merab, her will I give thee to wife; only be thou valiant for me, and fight the LORD’S battles.’ For Saul said: ‘Let not my hand be upon him, but let the hand of the Philistines be upon him.’
Read halakhic rulings (Jewish law) on I Samuel 18:17 from the Mishneh Torah and classical halakhic sources, free online.