The Messenger of Allah ﷺ said, "The believer to another believer is like a building whose parts support one another."
حدثنا ابن إدريس عن بريد عن جده
قال رسول الله ﷺ المؤمن للمؤمن كالبنيان يشد بعضه بعضا
Its chain of transmission is sahih. Ibn Idris here is Shafii, the Imam, and the hadith is like the one before it.