'Door posts' in the Bible

And they shall take of the blood, and put upon the two door-posts and upon the upper-beam, - upon the houses wherein they are to eat it.

Then shall ye take a bunch of hyssop, and dip it in the blood which is in the basin, and strike the upper beam and the two door-posts, with the blood which is in the basin, - and, ye, shall not go forth any man out of the entrance of his house, until morning,