In Genesis, who shut Noah inside the Ark before the Flood?

In Genesis, the LORD shut Noah inside the Ark before the Flood.

Genesis 7:16 says that Noah, his family, and the animals entered the Ark as God had commanded, and then the LORD shut him in. The detail appears immediately before the account of the rising waters and emphasizes divine protection of those inside.

The verse does not describe Noah fastening the entrance himself, nor does it name an angel as the one who closed it. This detail is separate from the Ark’s construction instructions, which earlier chapters attribute to God’s commands but describe Noah carrying out. It also differs from later artistic depictions that often show Noah closing a large door.