Al-Baqarah 2:189

Yas-aloonaka AAani al-ahillati qul hiya mawaqeetulinnasi walhajji walaysa albirrubi-an ta/too albuyoota min thuhooriha walakinnaalbirra mani ittaqa wa/too albuyoota min abwabihawattaqoo Allaha laAAallakum tuflihoon

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.

They ask you about the new moons. Say: They are indicative of time for the people, and of the Hajj. It is not righteousness that you come into your houses from their backs, but righteousness is that one fears Allah. So come into houses through their doors; and fear Allah so that you may be successful.