Verse 50. An atonement - For their error noted, ver. 14, 15, 16, and withal for a memorial, or by way of gratitude for such a stupendous assistance and deliverance. We should never take any thing to ourselves in war or trade, of which we cannot in faith consecrate a part to God, who hates robbery for burnt-offerings. But when God has remarkably preserved and succeeded us, he expects we should make some particular return of gratitude to him.