"A man said to Ibn 'Umar: 'Did the Messenger of Allah forbid soaking (fruits) in earthenware jars?' He said: 'Yes.' Tawus said: 'By Allah, I heard that from him.'"
Sunan an-Nasa'i Book 51, Hadith 76
← Previous Hadith (fruits) would be soaked for the Prophet in a small vessel made of stone.

Sunan an-Nasa'i Book 51, Hadith 75 Next Hadith → "We heard Tawus say: 'A man came to Ibn 'Umar and said: Did the Messenger of Allah forbid soaking (fruits) in earthenware jars? He said: 'Yes.' Ibrahim added in his Hadith: "And Ad-Dubba' (gourds).'"

Sunan an-Nasa'i Book 51, Hadith 77