´It was narrated that Tawus said:` "A man said to Ibn 'Umar: 'Did the Messenger of Allah [SAW] forbid soaking (fruits) in earthenware jars?' He said: 'Yes.' Tawus said: 'By Allah, I heard that from him.'"
Explanation & Benefits
Hafiz Muhammad Ameen
Here, although only the general mention of a water jug (matka) is made, in other narrations there is also the condition that the jug whose pores have been sealed by applying tar or oil. See the details in (Ahadith: 5550, 5615, 5616).
Source: Sunan Nasa'i: Translation and Benefits by Shaykh Hafiz Muhammad Amin Hafizullah, Page: 5617