Islamic law
Islamic law can refer to:

[T]errorists themselves repeatedly and consistently explain and justify their actions by reference to the teachings of Islam – particularly to the imperative, deeply embedded within the Islamic tradition, to subjugate all non-Islamic polities under the rule of Islamic Sharia law.

Robert Spencer,

We must know that [wife] beating is a punishment in Islamic religious law....Islam is a religion that forbids beating the face even of beasts. It is forbidden to beat even a donkey on its face....[The Koran says:] "and beat them." This verse is of a wondrous nature.