All of Allah’s Messengers observed the essence of Islam in their apparent and inward character, namely the complete submission to Allah, which can be summarised in the realisation of the testimony of faith: There is no God worthy of worship in truth except Allah (God) and Muḥammad is His messenger. This testimony of faith incorporates pure monotheism. The meaning of the first part of the testimony of faith is that no one deserves to be worshipped in Allah’s Kingdom except God alone, and that whatever and whoever is worshipped besides Him is a false deity. Allah says, “That is because Allah is the Truth (the only True Allah of all that exists, Who has no partners of rivals with Him) and what the (the polytheists) invoke besides Him, it is falsehood” (Q 22:62) The meaning of the second part of the testimony of faith is to testify and declare in words and deeds that Muḥammad, son of ‘Abdullah who belonged to the family of Hāshim, within the tribe of Quraysh, (which was the noblest tribe of the Quraysh who were from the Arabian race), is truly the last of Allah’s Messengers, that he was sent from his Lord with the truth to all mankind as a bearer of glad tidings and a warner, that he should be obeyed in whatever he commanded and forbade, and that Allah is only to be worshipped by what he himself legislated, not by one’s whims, desires and innovations in religion.