Surah Al-Baqarah (The Cow), Verse 189

یَسْـَٔلُوْنَكَ عَنِ الْاَهِلَّةِ قُلْ هِیَ مَوَاقِیْتُ لِلنَّاسِ وَالْحَجِّ وَلَیْسَ الْبِرُّ بِاَنْ تَاْتُوا الْبُیُوْتَ مِنْ ظُهُوْرِهَا وَلٰكِنَّ الْبِرَّ مَنِ اتَّقٰی وَاْتُوا الْبُیُوْتَ مِنْ اَبْوَابِهَا وَاتَّقُوا اللّٰهَ لَعَلَّكُمْ تُفْلِحُوْنَ ۟

Yas'aloonaka 'anil ahillati qul hiya mawaaqeetu linnaasi wal Hajj; wa laisal birru bi an ta'tul buyoota min zuhoorihaa wa laakinnal birra manit taqaa; wa'tul buyoota min abwaa bihaa; wattaqullaaha la'allakum tuflihoon

“They ask thee concerning the New Moons. Say: They are but signs to mark fixed periods of time in (the affairs of) men, and for Pilgrimage. It is no virtue if ye enter your houses from the back: It is virtue if ye fear Allah. Enter houses through the proper doors: And fear Allah: That ye may prosper.”

Quran 2:189 (Yusuf Ali Translation)