Sayyiduna Abu Hurayrah (may Allah be pleased with him) narrates from the Prophet (peace and blessings be upon him) that he (peace and blessings be upon him) said: "Allah continues to fulfil the need of a servant as long as he remains engaged in the need of his brother."
Hadith Referenceالمعجم الكبير للطبراني / باب الزاي / 4785