question #1 Sahih al-Bukhari 1803, Book 26, Hadith 28 : What cultural practices were addressed by the revelation of the verse mentioned in the narration?

I heard Al-Bara’ saying, “The above Verse was revealed regarding us, for the Ansar on returning from
Hajj never entered their houses through the proper doors but from behind. One of the Ansar came and
entered through the door and he was taunted for it. Therefore, the following was revealed: —
“It is not righteousness That you enter the houses from the back, But the righteous man is He who
fears Allah, Obeys His order and keeps away from What He has forbidden So, enter houses through
the proper doors.” (2.189)