The Prophet ﷺ said, "A believer to another believer is like a building, each part supporting the other," and he interlaced his fingers.
عن النبي ﷺ قال: المؤمن للمؤمن كالبنيان يشد بعضه بعضا وشبك بين أصابعه.
Bukhari narrated it in the Book of Grievances (2446), and Muslim in the Book of Righteousness and Kinship Ties (2585), both from the hadith of Abu Usama, from Buraid, from Abu Burda, from Abu Musa, who mentioned it.