1 Chronicles 12:19

And some of Manasseh passed over to David, when he came with the Philistines against Saul to battle, although they did not help them, for the cardinals of the Philistines, upon counsel, sent him away, saying, He will pass over to his master Saul with our heads.

1 Samuel 29:2-9

And as the cardinals of the Philistines reviewed their companies of hundreds and of thousands, David and his men were in the rear 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 as the cardinals of the Philistines reviewed their companies of hundreds and of thousands, David and his men were in the rear with Achish.