John Wesley on Numbers 31:50

An atonement - For their error noted, Nu 31:14,15,16, 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.