Answers about…
door-posts in the Bible

The Jews were commanded to write the divine name on the posts (mezuzoth') of their doors (Deuteronomy 6:9). The Jews, misunderstanding this injunction, adopted the custom of writing on a slip of parchment these verses (Deuteronomy 6:4-9, and 11:13-21), which they enclosed in a reed or cylinder and fixed on the right-hand door-post of every room in the house.

The servant who did not wish to leave

A Hebrew servant due to go free in the 7th year could choose to stay. His master took him to the doorpost and pierced his ear with an awl; then he served for life (Exodus 21:5–6; Deuteronomy 15:16–17). The ear that hears the master’s voice was fastened to that house.