A companion of the Messenger narrates that we were on an expedition towards Persia, during which the Messenger of Allah, peace and blessings be upon him, said: Whoever sleeps on the roof of a house that has no covering (or barrier), and if he falls and dies, then there will be no liability for him. Similarly, whoever undertakes a sea journey while the sea is turbulent, and he (drowns and) dies, then there will also be no liability for him.