Al-Baqara 2:189

They ask you about the phases of the moon. Say, “They are a means for people to determine time and pilgrimage.” It is not righteousness to enter the houses from the rear [in pilgrimage][86], but righteousness is to fear Allah. So enter the houses through their doors, and fear Allah so that you may succeed.

[86] It was an Arab practice prior to Islam to enter their houses from the back after assuming ihrām for pilgrimage, considering it an act of obedience.

They ask you, [O Muḥammad], about the crescent moons. Say, "They are measurements of time for the people and for ḥajj [pilgrimage]." And it is not righteousness to enter houses from the back, but righteousness is [in] one who fears Allāh. And enter houses from their doors. And fear Allāh that you may succeed.

189. They ask you (O Muhammad صلى الله عليه وسلم) about the new moons. Say: These are signs to mark fixed periods of time for mankind and for the pilgrimage. It is not Al-Birr (piety, righteousness) that you enter the houses from the back but Al-Birr (is the quality of the one) who fears Allâh. So enter houses through their proper doors, and fear Allâh that you may be successful.

They ask thee, (O Muhammad), of new moons, say: They are fixed seasons for mankind and for the pilgrimage. It is not righteousness that ye go to houses by the backs thereof (as do the idolaters at certain seasons), but the righteous man is he who wardeth off (evil). So go to houses by the gates thereof, and observe your duty to Allah, that ye may be successful.