Aslam

(11) Birth-control: It is a rule of cohabitation that the semen should not be thrown out of uterus as with God decreed must come to pass. The Prophet also said so. There are differences of opinion among the learned men regarding Ajal which means throwing of semen not in the uterus but outside it. One party say that Ajal is lawful under all circumstance and another party say that it is unlawful under all circumstances. Another party say that with the consent of wife, it is lawful . Another party say that in case of female, slaves, it is lawful and not in case of free women. To us, the custom o f Ajal is lawful, but it is not commendable for the reason that the merits of throwing semen in uterus were given up. For instance, it is Makruh or not commendable if a person sits idle in mosque without remembering God. The object is that not do a thing for which it is intended is Makruh. There is virtue in producing a child but it is given up in Ajal. The Prophet said : If a man cohabits with his wife, the reward of producing a child is written for him — such a child who becomes martyr fighting in the way of God. He said this in consideration of reward, because if a child is born like this he will get reward , for producing a cause in the way of God.
This is possible if semen is thrown into uterus.

Vol-II The Book of Wordly Usages 39