It is narrated from Sayyiduna Abdullah bin Abbas, may Allah be pleased with them both, he says: The Messenger of Allah, peace and blessings be upon him, was present in the house of one of his wives, when suddenly he, peace and blessings be upon him, rested his head and fell asleep, and smiled in his sleep. When he, peace and blessings be upon him, woke up, that Mother of the Believers said: You smiled in your sleep, what made you laugh? He, peace and blessings be upon him, said: I am amazed at those people of my Ummah who will travel across this sea to terrify the enemy; they will be striving in the path of Allah. Then he, peace and blessings be upon him, mentioned great goodness for them.