וַיַּחְמֹ֣ל הַמֶּ֔לֶךְ עַל־מְפִי־בֹ֖שֶׁת בֶּן־יְהוֹנָתָ֣ן בֶּן־שָׁא֑וּל עַל־שְׁבֻעַ֤ת יְהוָה֙ אֲשֶׁ֣ר בֵּֽינֹתָ֔ם בֵּ֣ין דָּוִ֔ד וּבֵ֖ין יְהוֹנָתָ֥ן בֶּן־שָׁאֽוּל׃
But the king spared Mephibosheth, the son of Jonathan the son of Saul, because of the LORD’S oath that was between them, between David and Jonathan the son of Saul.
Read the Targum (classical Aramaic translation) of II Samuel 21:7: Targum Onkelos and other Aramaic renditions, free online, no signup.