This means that a person believes that Allaah alone is the Lord, Sovereign and Controller, the Creator and Provider. He affirms all His most beautiful names and the sublime attributes that Allaah has affirmed for Himself or that His Prophet (peace and blessings of Allaah be upon him) affirmed for Him. He believes that Allaah alone, and no one else, is the Only One Who is deserving of worship, as Allaah says (interpretation of the meaning):
“He is the Originator of the heavens and the earth. How can He have children when He has no wife? He created all things and He is the All-Knower of everything.Such is Allaah, your Lord! Laa ilaaha illa Huwa (none has the right to be worshipped but He), the Creator of all things. So worship Him (Alone), and He is the Wakeel (Trustee, Disposer of affairs or Guardian) over all things”[al-An’aam 6:101-102]
And he believes that Allaah sent His Messenger Muhammad (peace and blessings of Allaah be upon him), and revealed to him the Qur’aan, and commanded him to convey this religion to all of mankind. He believes that loving Allaah and His Messenger and obeying them are duties which are obligatory upon all of mankind, and that love of Allaah can only be realised by following His Messenger (peace and blessings of Allaah be upon him):
“Say (O Muhammad to mankind): ‘If you (really) love Allaah, then follow me (i.e. accept Islamic Monotheism, follow the Qur’aan and the Sunnah), Allaah will love you and forgive you your sins. And Allaah is Oft-Forgiving, Most Merciful” [Aal ‘Imraan 3:31 – interpretation of the meaning]
Whoever is such that his 'Eemaan (true belief) and his Tawheed is strong, and his attachment to Allaah the Mighty and Majestic, this fact may be a means for wiping away all of his evil deeds.