Musannaf Ibn Abi Shayba 1:1392

Hammad ibn Khalid narrated to us, from Malik ibn Anas, from Safwan ibn Sulaym, from Sa'id ibn Salamah, from al-Mughirah ibn Abi Burdah, that he heard Abu Hurayrah saying: The Messenger of Allah (peace and blessings of Allah be upon him) said: "The sea is that whose water is purifying and whose dead [creatures] are lawful."