'Sideposts' in the Bible

And they shall take of the blood, and strike it on the two side posts and on the upper door post of the houses, wherein they shall eat it.

And ye shall take a bunch of hyssop, and dip it in the blood that is in the bason, and strike the lintel and the two side posts with the blood that is in the bason; and none of you shall go out at the door of his house until the morning.

For the LORD will pass through to smite the Egyptians; and when he seeth the blood upon the lintel, and on the two side posts, the LORD will pass over the door, and will not suffer the destroyer to come in unto your houses to smite you.

And for the entering of the oracle he made doors of olive tree: the lintel and side posts were a fifth part of the wall.