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"So they routed them by Allaah's Leave and Dawud (David) killed Jalut (Goliath), and Allaah gave him [Dawud (David)] the kingdom [after the death of Talut (Saul) and Samuel] and Al-Hikmah (Prophethood), and taught him of that which He willed, And if Allaah did not check one set of people by means of another, the earth would indeed be full of mischief, But Allaah is full of Bounty to the 'Alameen (mankind, jinns and all that exists)." [Al-Baqarah (2):251]

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]