Jami` at-Tirmidhi 241
جامع الترمذي#241Da'ifAnas bin Malik narrated that :Allah's Messenger said: "Whoever performs Salat for Allah for forty days in congregation, catching the first Takbir, two absolutions are written for him: absolution from the Fire, and absolution from the Fire, and absolution from hypocrisy
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirHasan
Al-AlbaniHasan
Zubair Ali ZaiDaif
In-book reference: 2:93