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"And whosoever submits his face (himself) to Allaah [i.e.(follows Allaah's Religion of Islaamic Monotheism), worships Allaah (Alone) with sincere Faith in the (1) Oneness of His Lordship,(2) Oneness of His worship, and (3) Oneness of His Names and Qualities], while he is a Muhsin (good-doer i.e, performs good deeds totally for Allaah's sake without any show-off or to gain praise or fame etc, and does them in accordance with the Sunnah of Allaah's Messenger Muhammad sal-Allaahu 'alayhe wa sallam), then he has grasped the most trustworthy hand-hold [La Ilaaha ill-Allaah (none has the right to be worshipped but Allaah)], And to Allaah return all matters for decision." [Luqmaan (31):22]

Narrated Ziyad bin'Ilaqa:

I heard Jarir bin 'Abdullah (Praising Allah). On the day when Al-Mughira bin Shu'ba died, he (Jarir) got up (on the pulpit) and thanked and praised Allah and said, "Be afraid of Allah alone Who has none along with Him to be worshipped.(You should) be calm and quiet till the (new) chief comes to you and he will come to you soon. Ask Allah's forgiveness for your (late) chief because he himself loved to forgive others." Jarir added, "Amma badu (now then), I went to the Prophet and said, 'I give my pledge of allegiance to you for Islam." The Prophet conditioned (my pledge) for me to be sincere and true to every Muslim so I gave my pledge to him for this. By the Lord of this mosque! I am sincere and true to you (Muslims). Then Jarir asked for Allah's forgiveness and came down (from the pulpit). [The Book of Faith Volume 1, Book 2, Hadeeth 55]