'Door post' in the Bible

And they shall take of the blood and strike on the two side posts and on the upper doorpost of the houses, wherein they eat him.

For the LORD will go about and smite Egypt. And when he seeth the blood upon the upper door post and on the two side posts, he will pass over the door and will not suffer the destroyer to come into your house to plague you.

Then let his master bring him unto the judges and set him to the door or the doorpost, and bore his ear through with an awl, and let him be his servant forever.

Then shall the prince come under the door porch, and stand still without by the door check. So the priests shall offer up his burnt and health offerings. And he shall worship at the door post, and go his way forth again: but the door shall no more be shut till the evening.