Jami` at-Tirmidhi 208

جامع الترمذي#208Sahih

Abu Sa'eed narrated that :Allah's Messenger said: "Whenyou hear the call (to prayer) then say the similar to what the Mu'adh-dhin says

Scholarly Authentication

We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:

Ahmad Muhammad ShakirSahih

Al-AlbaniSahih

Bashar Awad MaaroufHasan Sahih

Zubair Ali ZaiSahih - Agreed Upon

In-book reference: 2:60