1 Chronicles 12:19

And of Manasseh, there fell certain unto David when he went with the Philistines against Saul to battle, but helped them not. For the lords of the Philistines took counsel and sent him away saying, "He will fall to his master Saul to the Jeopardy of our heads."

1 Samuel 29:2-9

And the lords of the Philistines went forth by hundreds and by thousands. But David and his men came behind with Achish.

Treasury of Scripture Knowledge

Summary

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

When he came

Bible References

When he came

1 Samuel 29:2
And the lords of the Philistines went forth by hundreds and by thousands. But David and his men came behind with Achish.