Al-Kāfi

Hadith 293
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2ـ حَمَّادٌ عَنِ الْحَلَبِيِّ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ السَّلاَم) قَالَ كَانَ عَلِيٌّ (عَلَيْهِ السَّلاَم) يَقُولُ لا أُجِيزُ فِي الْهِلالِ إِلاَّ شَهَادَةَ رَجُلَيْنِ عَدْلَيْنِ.
2. Hammad has narrated from al-Halabiy who has said the following: “Abu ‘Abd Allah (a.s.), has said that ’Amir al-Mu’minin (a.s.), would say, ‘I do not accept a testimony about seeing the crescent if it is from less than two just witnesses.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī