4:7 the ark. As the ark is prominent in ch. 3, so is it central to the retelling of the story to future generations. See notes 3:3, 17.

memorial. The purpose of the “sign” (v. 6) and telling about it is for future generations to remember the wonderful faithfulness of God to His promises. On the importance of such remembering for Israel, see Deut. 8:1–20; 1 Cor. 11:25; 2 Tim. 2:8.