'Tent door' in the Bible

And the LORD appeared unto him in the oak grove of Mamre as he sat in his tent door in the heat of the day.

And he lift up his eyes and looked: and lo, three men stood not far from him. And when he saw them, he ran to meet them from the tent door, and fell to the ground

And he said, "I will come again unto thee as soon as the fruit can live. And lo, Sara thy wife shall have a son." That heard Sara, out of the tent door which was behind his back.

And when Moses went out unto the tabernacle, all the people rose up and stood every man in his tent door and looked after Moses, until he was gone into the tabernacle.

And when all the people saw the clouden pillar stand in the tabernacle door, they rose up and worshipped: every man in his tent door.