the prophet, may allah exalt his mention, said:

'my example and the example of the prophets before me is like a man who built a house, which he built and perfected except for the space of one block; people would go round the house and stare in awe at its perfection and say, 'had it not been for this space!' the prophet, may allah exalt his mention, said: 'i am that brick, i am the last of prophets.'  (bukhari #3342)