Sunan Abi Dawud 1310
سنن أبي داود#1310SahihNarrated 'Aishah, wife of Prophet (ﷺ):When one of you dozes in prayer he should sleep till his sleep is gone, for when one of you prays while he is dozing, perhaps he might curse himself if he begs pardon of Allah
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 ZaiSahih Bukhari (212) Sahih Muslim (786)
In-book reference: 5:61