Matthew Poole and continuators on 1 Chronicles 12:19

19 And there fell some of Manasseh to David (when he came with the Philistins against Saul to battel, but they helped them not ; for the lords of the Philistins, upon advisement, sent him away, saying, He will fall to his master Saul, to the jeopardy of our heads.)

i. e. The Manassites here named, and the rest of Davids Forces to whom they had now joyned themselves did not help the Philistins in Battel, as David had pretended to do.

Marginal references: 1 Sam. 29. 4.; Heb. on our heads.