It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Holy 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 splendid building, except that he left a space for one brick in its corner. People would walk around it, marvel at it, and say, "We have never seen a more excellent building than this, except for the place of this brick." So I am that brick.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 7485
Hadith Gradingحکم دارالسلام:حديث صحيح، خ: 3535، م: 2286، وهذا الإسناد فيه خطأ، وانظر مابعده.