Sunan an-Nasa'i 2140
It was narrated from Ibn 'Umar that the Prophet ﷺ 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.
أَخْبَرَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، قَالَ حَدَّثَنَا عَبْدُ الرَّحْمَنِ، عَنْ سُفْيَانَ، عَنِ الأَسْوَدِ بْنِ قَيْسٍ، عَنْ سَعِيدِ بْنِ عَمْرٍو، عَنِ ابْنِ عُمَرَ، عَنِ النَّبِيِّ ﷺ قَالَ " إِنَّا أُمَّةٌ أُمِّيَّةٌ لاَ نَكْتُبُ وَلاَ نَحْسِبُ الشَّهْرُ هَكَذَا وَهَكَذَا وَهَكَذَا " . ثَلاَثًا حَتَّى ذَكَرَ تِسْعًا وَعِشْرِينَ .
Classification
Sahih (Authentic)
References
Sunan an-Nasa'i 2140
Sunan an-Nasa'i Vol. 3, Book of Fasting, Hadith 2142