Sunan an-Nasa'i 160
سنن النسائي#160SahihSa'eed - meaning Ibn Al-Musayyab - and 'Abbad bin Tamim narrated that his uncle - 'Abdullah bin Zaid - said:"A man who felt something during Salah complained to the Prophet (ﷺ). He said: 'Do not stop praying unless you notice a smell or hear a sound
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiHasan
In-book reference: 1:161