It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: The example of me and the prophets before me is like that of a man who built a very beautiful and complete building, except that he left a space for one brick in one of its corners. People would walk around it, marvel at it, and say, "We have never seen a more splendid building than this, except for the place of this brick." So I am that brick, and I am the Seal of the Prophets.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 9167