Psalms 144:10

Cp. Psalms 18:50. Who giveth salvation(or victory) unto kingsmay be meant as a general truth not to be limited to Israel only (cp. Psalms 33:16), and David his servantmay denote the typical ruler of Jehovah's people (cp. Ezekiel 34:23); or the reference may be historical, whogave victory … whorescued David.

the hurtful(lit. evil) sword i.e. from the calamity of war. The Targ. renders -the evil sword of Goliath," but the reference is quite general.