It is narrated from Hazrat Ubayy bin Ka'b (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: Among the noble Prophets (peace be upon them), my example is like that of a person who built a beautiful and complete house and left the place of one brick empty. People would walk around that building in amazement and say, "If only the place of this brick were also completed (then this building would be complete)." Among the noble Prophets (peace be upon them), I am like that brick.