Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
nasai-kubra:2432ʿAlī b. Ḥujr > Ismāʿīl > Muḥammad / Ibn Abū Ḥarmalah > Kurayb

[Machine] Um al-Fadl sent him to Mu'awiyah ibn Abi Sufyan in Damascus. He said: I arrived in Damascus and fulfilled her request. And the moon of Ramadan was sighted for me while I was in Damascus on the night of Friday. Then I arrived in Madinah at the end of the month, and Abdullah ibn Abbas asked me about the sighting of the moon. I told him that we saw it on the night of Friday. He asked: "You saw it on the night of Friday?" I said: "Yes, and people also saw it. So they fasted and Mu'awiyah also fasted." He said: "But we saw it on the night of Saturday, so we will continue to fast until we complete thirty days or sight it." I said: "Why don't you suffice with the sighting of Mu'awiyah and his companions?" He said: "No, this is how the Messenger of Allah ﷺ commanded us."  

الكبرى للنسائي:٢٤٣٢أَخْبَرَنَا عَلِيُّ بْنُ حُجْرٍ قَالَ أَخْبَرَنَا إِسْمَاعِيلُ قَالَ حَدَّثَنَا مُحَمَّدٌ وَهُوَ ابْنُ أَبِي حَرْمَلَةَ قَالَ أَخْبَرَنِي كُرَيْبٌ

أَنَّ أُمَّ الْفَضْلِ بَعَثَتْهُ إِلَى مُعَاوِيَةَ بِالشَّامِ قَالَ فَقَدِمْتُ الشَّامَ فَقَضَيْتُ حَاجَتَهَا وَاسْتَهَلَّ عَلَيَّ هِلَالُ رَمَضَانَ وَأَنَا بِالشَّامِ فَرَأَيْتُ الْهِلَالَ لَيْلَةَ الْجُمُعَةِ ثُمَّ قَدِمْتُ الْمَدِينَةَ فِي آخِرِ الشَّهْرِ فَسَأَلَنِي عَبْدُ اللهِ بْنُ عَبَّاسٍ ثُمَّ ذَكَرَ الْهِلَالَ فَقَالَ مَتَى رَأَيْتُمْ؟ فَقُلْتُ رَأَيْنَاهُ لَيْلَةَ الْجُمُعَةِ قَالَ أَنْتَ رَأَيْتَهُ لَيْلَةَ الْجُمُعَةِ؟ قُلْتُ نَعَمْ وَرَآهُ النَّاسُ فَصَامُوا وَصَامَ مُعَاوِيَةُ قَالَ لَكِنْ رَأَيْنَاهُ لَيْلَةَ السَّبْتِ فَلَا نَزَالُ نَصُومُ حَتَّى نُكْمِلَ ثَلَاثِينَ أَوْ نَرَاهُ فَقُلْتُ أَوَلَا تَكْتَفِي بِرُؤْيَةِ مُعَاوِيَةَ وَأَصْحَابِهِ؟ قَالَ «لَا هَكَذَا أَمَرَنَا رَسُولُ اللهِ ﷺ»