In Genesis, God shuts the door of Noah’s Ark after the family enters.
Genesis 7:16 says that Noah, his family, and the animals entered the Ark as commanded, and then the LORD shut Noah in. The wording places the final closing of the Ark under divine action rather than describing Noah or one of his sons fastening the door.
This detail appears after Genesis gives the instructions for building the Ark and bringing living creatures aboard. It marks the transition from preparation to the beginning of the Flood. The passage also emphasizes that the Ark’s occupants enter according to the command they received.
Readers sometimes remember the Ark’s door as something Noah personally closed because Noah is the central human figure in the narrative. Genesis, however, specifically attributes the closing to God. The episode is therefore distinct from the Ark’s construction, which Genesis says Noah carried out.