en_tn_condensed/1sa/18/10.md

a harmful spirit from God

"a spirit that causes trouble" or "an evil spirit." See 1 Samuel 16:15.

a harmful spirit from God rushed upon Saul

The harmful spirit influenced Saul, causing him to be troubled and act crazy. See 1 Samuel 10:6.

he prophesied

"a spirit caused him to speak." or "he spoke words that made no sense."