Musannaf Ibn Abi Shayba 17:1264

Yazid ibn Harun narrated to us, he said: Hisham ibn Hassan informed us, from Muhammad ibn Wasi’, from Abu Salih, from Abu Hurayrah, he said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Whoever conceals his Muslim brother in the world, Allah will conceal him in the Hereafter. And whoever relieves a distress from his brother from the distresses of the world, Allah will relieve from him a distress on the Day of Resurrection. And Allah is in the aid of the servant as long as the servant is in the aid of his brother."