'Door post' in the Bible

then his master shall bring him to God [that is, to the judges who act in God’s name], then he shall bring him to the door or doorpost. And his master shall pierce his ear with an awl (strong needle); and he shall serve him for life.

“Behind the door and the doorpostYou have set up your [pagan] symbol;Indeed, far removed from Me, you have uncovered yourself,And have gone up and made your bed wide.And you have made a [new] agreement for yourself with the adulterers,You have loved their bed,You have looked [with passion] on their manhood.