5 Joshua said to them, “Pass over before the ark of Yahweh your God into the middle of the Jordan, and each of you pick up a stone and put it on your shoulder, according to the number of the tribes of the children of Israel;

Matthew Henry's Commentary on Joshua 4:5

Commentary on Joshua 4:1-9

(Read Joshua 4:1-9)

The works of the Lord are so worthy of rememberance, and the heart of man is so prone to forget them, that various methods are needful to refresh our memories, for the glory of God, our advantage, and that of our children. God gave orders for preparing this memorial.