Abu Hurairah said: “A man asked the Prophet صلی اللہ علیہ وآلہ وسلم: ‘Messenger of Allah صلی اللہ علیہ وآلہ وسلم, we travel by sea and we take a little water with us, but if we use it for Wudu’, we will go thirsty. Can we perform Wudu’ with sea-water?’ The Messenger of Allah صلی اللہ علیہ وآلہ وسلم said: ‘Its water is a means of purification and its dead meat is permissible.” (Sahih)