The Seal of the Prophethood ...

God now said to Muhammad(pbuh): 'I gave my past messengers many wise words to convey to the people; and these words were written down to guide future generations. Each of these messengers knew that I would send a further messenger to confirm the message I had given them. Do you accept this? Will you take up this burden?'

Muhammad (pbuh) answered: 'I accept.'

-Ibn Ishaq, "The Life of Muhammad"