Sunan Ibn Majah 477
سنن ابن ماجه#477Da'ifIt was narrated from 'Ali bin Abu Talib that:The Messenger of Allah said: "The eye is the leather strap (that ties up) the anus, so whoever falls asleep, let him perform ablution
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniHasan
Muhammad Fouad Abd al-BaqiHasan
Shuaib Al ArnautSanad Daif
Zubair Ali ZaiDaif
In-book reference: 1:211