Online Bible Commentary on 1 Chronicles 12:19. Of Manasseh also there fell away some 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 away to his master Saul to the jeopardy of our heads.


http://qbible.com/comments/1-chronicles/12-19.html