Al-Kāfi - The Book of Fasting

Chapter: Verifying the Rise of the New Moon and Finding Witnesses for It 1ـ عَلِيُّ بْنُ إِبْرَاهِي٠َ عَنْ أَبِيهِ عَنِ ابْنِ أَبِي عُ٠َّادٍ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ السَّلاَ٠) قَالَ إِذَا رَأَوُا الْهِلالَ قَبْلَ الزَّوَالِ فَهُوَ لِلَيْلَتِهِ الْ٠َاضِيَةِ وَإِذَا رَأَوْهُ بَعْدَ الزَّوَالِ فَهُوَ لِلَيْلَتِهِ الْ٠10.

Ali ibn Ibrahim has narrated from his father from Ibn Abi ‘Umayr from Hammad who has said the following: “Abu ‘Abd Allah (a.s.), has said, ‘If they can see the crescent before Zawal (declining of the sun toward the west at noontime), then it is of the last night but if they see it after Zawal, then it is of the coming night.’” حسن - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (6/231))