According to Genesis, the LORD shut Noah inside the Ark after he entered.
Genesis 7:16 says that Noah, his family, and the animals entered as commanded, and that the LORD shut him in. The detail places the final closing of the ark under divine action rather than describing Noah fastening the door himself.
The statement follows the instructions in Genesis 6 and 7, where Noah is told to bring his household and representatives of the animals into the vessel. Once the entry is complete, the narrative moves directly to the beginning of the flood.
This detail is often confused with the ark’s construction, where Noah is the human builder. The passage distinguishes between Noah’s obedience and labor and the divine act that seals the ark before the waters rise. Different English Bible translations may render the divine name as “the LORD” or “Yahweh,” but they refer to the same subject in this verse.