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"And whoever of you have not the means wherewith to wed free, believing women, they may wed believing girls from among those (captives and slaves) whom your right hands possess, and Allaah has full knowledge about your Faith, you are one from another, Wed them with the permission of their own folk (guardians, Awliyaa' or masters) and give them their Mahr according to what is reasonable; they (the above said captive and slave-girls) should be chaste, not adulterous, nor taking boy-friends, And after they have been taken in wedlock, if they commit illegal sexual intercourse, their punishment is half that for free (unmarried) women, This is for him among you who is afraid of being harmed in his religion or in his body; but it is better for you that you practise self-restraint, and Allaah is Oft-Forgiving, Most Merciful." [An-Nisaa' (4):25]

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]