The Messenger of Allah ﷺ said, "Whoever relieves a believer of a hardship from the hardships of this world, Allah will relieve him of a hardship from the hardships of the Hereafter. Whoever conceals the faults of a Muslim, Allah will conceal his faults in this world and the Hereafter. Allah remains in the aid of His servant as long as the servant remains in the aid of his brother."
حدثنا قتيبة حدثنا أبو عوانة عن الأعمش عن أبي صالح
قال رسول الله ﷺ من نفس عن مؤمن كربة من كرب الدنيا نفس الله عنه كربة من كرب الآخرة ومن ستر على مسلم ستره الله في الدنيا والآخرة والله في عون العبد ما كان العبد في عون أخيه
Muslim also narrated it in the Book of Remembrance and Supplication, chapter on the virtue of gathering to recite the Quran and to engage in remembrance, hadith no. 2699, and Abu Dawud, hadith no. 4946, from the hadith of Amash through this same route, and it will come again at no. 1930.On this subject there is also a report from Uqba bin Amir [Abu Dawud, hadith no. 4892] and from Ibn Umar [coming at no. 1426].