Musannaf Ibn Abi Shaybah

Hazrat Mujahid says that he asked Hazrat Umar bin Abdul Aziz about those people whose boat breaks and when they come out, the time for prayer arrives (and they do not have any clothes on their bodies), so what should they do? He replied: Their imam will be on their left side. They will all form a row. Each person will cover his private parts with his left hand, but he will not touch the private parts.