Islam is against surrogacy because it is an obvious way of using donor sperm, a foreign element, in a woman’s womb, resulting in lineage mixing. The implementation of male sperm into the womb of a woman to whom he is not married transgresses Allah’s boundaries. Also, Islam has banned adultery (zina) completely, and all that leads to it. Islam attaches great importance to the preservation of the lineage. The protection and preservation of progeny (hifz al-nasl) is one of Shariah’s five universals. The introduction of a third party (surrogate mother) into the family equation would therefore, confuse the lineage. The use of a third person’s sperm or eggs would develop doubt and uncertainty about the identity of the child. By surrogacy, the lineage and identity of the child will not be preserved and protected.