John Gill Commentary Psalms 78:62

"He gave his people over also unto the sword, And was wroth with his inheritance." — Psalms 78:62 (ASV)

He gave his people over also to the sword
To those that kill with the sword, as the Targum; that is, to the Philistines, when there fell of them thirty thousand men at once, (1 Samuel 4:10)

and was wroth with his inheritance ;
and the above showed that he was, though they were his inheritance, his portion and possession, and he had chosen them for it, (Psalms 33:12) .