Sunan an-Nasa'i 4350
سنن النسائي#4350SahihIt was narrated from Abu Hurairah, that the Prophet (said), concerning the water of the sea:"Its water is pure (and Purification) and its 'dead meat' is permissible (to eat)
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiHasan
In-book reference: 42:88