WEB
Of Manasseh also there fell away some to David, when he came with the Philistines against Saul to battle; but they didn’t help them; for the lords of the Philistines sent him away after consultation, saying, “He will fall away to his master Saul to the jeopardy of our heads.”
YLT
And of Manasseh there have fallen unto David in his coming with the Philistines against Israel to battle—and they helped them not, for by counsel the princes of the Philistines sent him away, saying, ‘With our heads he doth fall unto his master Saul.’—