Musnad Ahmad 33:771

'Affan narrated to us, Sulaym ibn Hayyan narrated to us, Sa'id ibn Mina narrated to us, from Jabir ibn 'Abdullah, from the Prophet, peace and blessings of Allah be upon him, who said: "My likeness and the likeness of the prophets is like a man who built a house, then he completed it and perfected it, except for the place of a brick. So people began to enter it and marvel at it, and they would say: 'If only this place for the brick were filled.'" The Messenger of Allah, peace and blessings of Allah be upon him, said: "So I am that place of the brick; I came and sealed the prophets."