This hadith has been narrated on the authority of Abu Huraira through another chain of transmitters but with a slight variation of wording.
Sahih Muslim Book 48, Hadith 49
← Previous Hadith He who alleviates the suffering of a brother out of the sufferings of the world, Allah would alleviate his suffering from the sufferings of the Day of Resurrection, and he who finds relief for one who is hard-pressed, Allah would make things easy for him in the Hereafter, and he who conceals (the faults) of a Muslim, Allah would conceal his faults in the world and in the Hereafter. Allah is at the back of a servant so long as the servant is at the back of his brother, and he who treads the path in search of knowledge, Allah would make that path easy, leading to Paradise for him and those persons who assemble in the house among the houses of Allah (mosques) and recite the Book of Allah and they learn and teach the Qur'an (among themselves) there would descend upon them tranquility and mercy would cover them and the angels would surround them and Allah mentions them in the presence of those near Him, and he who is slow-paced in doing good deeds, his (high) lineage does not make him go ahead.

Sahih Muslim Book 48, Hadith 48 Next Hadith → I bear witness to the fact that both Abu Huraira and Abu Sa'id Khudri were present when Allah's Messenger may peace be upon him) said: The people do not sit but they are surrounded by angels and covered by Mercy, and there descends upon them tranquillity as they remember Allah, and Allah makes a mention of them to those who are near Him. This hadith has been narrated on the authority of Shu'ba with the same chain of transmitters.

Sahih Muslim Book 48, Hadith 50