Bulugh al-Maram

Narrated Abu Huraira: Allah’s Messenger (ﷺ) said regarding the sea, "It's water is purifying and its dead (animals) are lawful (to eat)." [Al- Arba’a and Ibn Abu Shaiba reported it (this version is of the latter). Ibn Khuzaima and Tirmidhi graded it Sahih. It was also reported by Malik, Shafi'i and Ahmad.]