'Tent door' in the Bible

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

And he lifted up his eyes and looked, and, lo, three men stood by him. And when he saw them, he ran to meet them from the tent door, and bowed himself to the earth,

And he said, I will certainly return to thee when the season comes round, and, lo, Sarah thy wife shall have a son. And Sarah heard in the tent door, which was behind him.

And it came to pass, when Moses went out to the tent, that all the people rose up, and stood, every man at his tent door, and looked after Moses, until he was gone into the tent.

And all the people saw the pillar of cloud stand at the door of the tent. And all the people rose up and worshipped, every man at his tent door.