(36) باب تَعَاوُنِ الْمُؤْمِنِينَ بَعْضِهِمْ بَعْضًا
Narrated Abu Musa:
The Prophet (ﷺ) said, "A believer to another believer is like a building whose different parts enforce each other." The Prophet (ﷺ) then clasped his hands with the fingers interlaced. (At that time) the Prophet (ﷺ) was sitting and a man came and begged or asked for something. The Prophet (ﷺ) faced us and said, "Help and recommend him and you will receive the reward for it, and Allah will bring about what He will through His Prophet's tongue."
Reference: Sahih al-Bukhari 6026, 6027
In-book reference: Book 78, Hadith 57
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 8, Book 73, Hadith 55