Narrator:Abu Hurayrah
وَبِإِسْنَادِهِ سَمِعْتُ أَبَا الْقَاسِمِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ صُومُوا لِرُؤْيَتِهِ وَأَفْطِرُوا لِرُؤْيَتِهِ فَإِنْ غُمَّ عَلَيْكُمْ فَعُدُّوا ثَلَاثِينَ
This hadith has no English translation yet: the Arabic text, the reference and the grade are shown here.
Reported by Ahmad (No. 9680, 7203, 7265, 7448, 7526, 9007, 9094, 9188), Al-Bukhari (No. 1909), Muslim (No. 1081a, 1081c, 1081d), At-Tirmidhi (No. 684), An-Nasa’i (No. 2117, 2118, 2119, 2123, 2138), Ibn Majah (No. 1655) and Ad-Darimi (No. 1623).