Charles Ellicott Commentary Psalms 144:1

"Blessed be Jehovah my rock, Who teacheth my hands to war, [And] my fingers to fight:" — Psalms 144:1 (ASV)

Strength.— Rather, rock. Compare to Psalms 18:2; Psalms 18:46. The Septuagint and Vulgate have “my God.”

Which teaches.— See Psalms 18:34. More literally,

Who trains my hands for war,
My fingers for fight.