הַנּוֹתֵ֥ן תְּשׁוּעָ֗ה לַמְּלָ֫כִ֥ים הַ֭פּוֹצֶה אֶת־דָּוִ֥ד עַבְדּ֗וֹ מֵחֶ֥רֶב רָעָֽה׃
Who givest salvation unto kings, Who rescuest David Thy servant from the hurtful sword.
Rashi on Psalms
Who gives salvation to kings This speaks about the Rock of the Divisions, when David was close to being seized by Saul (I Sam. 23:27): “A messenger came to Saul, saying, ‘Make haste and go, etc.’” He saved Saul from shedding innocent blood, and David from being killed.