And the example of the noble Prophets (peace be upon them) is like a man who built a building, made it beautiful, splendid, and perfect. People would walk around it and say, "We have never seen a building more beautiful than this, except that if this gap were also filled, how good it would be." (Of the building of the finality of Prophethood) I am that gap (who has now completed this building).
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 7322