Imaam Barbahaaree rahimahullaah said:
And know that the beginning of Islaam is the testification that none has the right to be worshipped except Allaah and that Muhammad is His slave and His Messenger.
And that whatever Allaah says is just as He said and nothing can contradict what He says and He is true to what He has said.
And to have eemaan (true faith) in all of the revealed laws.
- 1. Beginning of Islaam is Ash-Shahaadataan – Sharh as-Sunnah | Dawud Burbank (download audio)