Hadith 1979

Ibn ‘Umar said that the people tried to see the new moon and he informed God’s messenger that he had seen it, so he fasted and commanded the people to observe the fast." Abu Dawud and Darimi transmitted it.

وَعَنِ ابْنِ عُمَرَ قَالَ: تَرَاءَى النَّاسُ الْهِلَالَ فَأَخْبَرْتُ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِنِّي رَأَيْتُهُ فَصَامَ وَأَمَرَ النَّاسَ بِصِيَامِهِ. رَوَاهُ أَبُو دَاوُد والدارمي

Reference: 5619790
In-book reference: Book 7, Hadith 1979