From Sahih Muslim (Hadith 5961):
Abu Hurairh reported Allah's Messenger (ﷺ) as saying:The similitude of mine and that of the Apostles before me is that of a person who built a house quite imposing and beautiful, but for one brick in one of its corners. People would go round it, appreciating the building, but saying: Why has the brick not been fixed here? He said: I am that brick and I am the last of the Apostles
Reference: Muslim 5961