The Relationship Between the Believers
Abu Musa (radi Allahu anhu) reported that the Messenger of Allah (sal Allahu alaihi wa sallam) said, “The relationship of the believer with another believer is like (the bricks of) a building, each strengthens the other.” He (sal Allahu alaihi wa sallam) illustrated this by interlacing the fingers of both his hands.
[Sahih al-Bukhari and Muslim]
This Hadith enjoins unity in the Muslim community, each member of which is like a brick, which, when they are all combined, lend strength to each other. Similarly, Muslims are like hands and arms which, when physically joined together, are bound to co-operate with one another.
And Allah Knows Best!