“O People, no prophet or messenger will come after me and no new faith will be born. Reason well, therefore, O People, and understand words, which I convey to you. I am leaving you with the Book of God (the Quran) and my Sunnah (the sayings and practices as evidenced in the behavioural model of the Prophet). If you follow them you will never go astray.

“All those who listen to me shall pass on my words to
others and those to others again; and may the last ones understand my
words better than those who listen to me directly. Be my witness O God,
that I have conveyed your message to your people.”