(17) باب ذِكْرِ الاِخْتِلاَفِ عَلَى يَحْيَى بْنِ أَبِي كَثِيرٍ فِي خَبَرِ أَبِي سَلَمَةَ فِيهِ
It was narrated from Ibn 'Umar that the Prophet said:
"We are an unlettered Ummah, we do not use astronomical counting or computation. The month is like this, and this, and this," he did three times, showing it as twenty-nine. (ES)
Reference (ES): Sunan an-Nasa'i 2140 (ES)
In-book reference (ES): Book 22, Hadith 51 (ES)
English translation (ES): Vol. 3, Book 22, Hadith 2142 (ES)