Uqba bin 'Amir al-Juhayni · The Chapters on Pawning

“O Messenger of Allah (ﷺ), what are the things which are not permissible to withhold?” He said: “Water, salt and fire.” She said: “I said: 'O Messenger of Allah (ﷺ), we know what water is, but what about salt and fire?” He said: “O Humaira', whoever gives fire (to another), it is as if he has given in charity all the food that is cooked on that fire. And whoever gives salt, it is as if he has given in…

the Messenger of Allah (ﷺ) ruled concerning the stream of Mahzur that the water should be retained until it reached the ankles, then released.