Sahih Muslim: Hadith 6787

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.