'Tent door' in the Bible

The LORD appeared to him by the oaks of Mamre, as he sat in the tent door in the heat of the day.

He lifted up his eyes and looked, and saw that three men stood opposite him. When he saw them, he ran to meet them from the tent door, and bowed himself to the earth,

Then he said, "I will certainly return to you when the season comes round. Behold, Sarah your wife will have a son." Sarah heard in the tent door, which was behind him.

It happened that when Moses went out to the Tent, that all the people rose up, and stood, everyone at their tent door, and watched Moses, until he had gone into the Tent.

All the people saw the pillar of cloud stand at the door of the Tent, and all the people rose up and worshiped, everyone at their tent door.