Hadith #442
Ungraded
Arabic Text
وَبِإِسْنَادِهِ سَمِعْتُ أَبَا الْقَاسِمِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ صُومُوا لِرُؤْيَتِهِ وَأَفْطِرُوا لِرُؤْيَتِهِ فَإِنْ غُمَّ عَلَيْكُمْ فَعُدُّوا ثَلَاثِينَ
English Translation
With the same chain, he said: "I heard Abu al-Qasim (ﷺ) say: 'Fast upon sighting it (the crescent moon) and break your fast upon sighting it. If it is obscured from you, then complete thirty days.'"
Reference: Musnad Ahmad, Book 21, Hadith 442
Sunnah.com ref: Musnad Ahmad 9680
Islam.wiki ID: IWH-46070