Sunan Abi Dawud 2342
سنن أبي داود#2342SahihNarrated Abdullah ibn Umar: The people looked for the moon, so I informed the Messenger of Allah (ﷺ) that I had sighted it. He fasted and commanded the people to fast
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Shuaib Al ArnautSahih
Zubair Ali ZaiIsnaad Sahih
In-book reference: 14:30