Narrated Jabir bin Abdullah (may Allah be pleased with him): The Prophet (peace and blessings of Allah be upon him) said: "My example and the example of the other prophets is like that of a person who built a house and made it complete and beautiful, except for the place of one brick. People began to go around the house and were amazed, saying: 'If only this brick were placed, how excellent and complete this house would be.'"
In another narration from Sayyiduna Abu Hurairah (may Allah be pleased with him), it is transmitted in addition that .... but in one corner, a space equal to one brick was left. And at the end, he said: "I am that brick, and I am the Seal of the Prophets."