Adam Clarke on 1 Samuel 26:19

Let him accept an offering - If God have stirred thee up against me, why, then, let him deliver my life into thy hand, and accept it as a sacrifice. But as the word is מנחה minchah, a gratitude-offering, perhaps the sense may be this: Let God accept a gratitude-offering from thee, for having purged the land of a worker of iniquity; for, were I not such, God would never stir thee up against me.

But if they be the children of men - If men have, by false representations, lies, and slanders, stirred thee up against an innocent man, then let them be cursed before the Lord. If I am guilty, I deserve to die; if not, those who seek my life should be destroyed.

Saying, Go, serve other gods - His being obliged to leave the tabernacle, and the place where the true worship of God was performed, and take refuge among idolaters, said in effect, Go, serve other gods.