Sayyiduna Abu Musa (may Allah be pleased with him) reports that the Messenger of Allah (peace and blessings be upon him) said: "A believer to another believer is like a building, one part of which strengthens the other."
Hadith Referenceمسند الشهاب / 134
Hadith Gradingمحدثین:إسناده صحيح
Hadith Takhrij«إسناده صحيح ، و أخرجه البخاري 481، ومسلم : 2585، وترمذي : 1928،»
This hadith is also narrated from Abu Usamah through another chain in the same manner, and in it, it is mentioned that the Prophet (peace be upon him), to explain, interlaced the fingers of one hand with the fingers of the other hand and showed it.
Hadith Referenceمسند الشهاب / 135
Hadith Gradingمحدثین:إسناده صحيح
Hadith Takhrij«إسناده صحيح، وأخرجه البخاري 2446، و مسلم 6586، و الترمذي : 1928»