Narrated Abyad ibn Hammal:
Abyad went to the Messenger of Allah (ﷺ) and asked him for assigning him (the mines of) salt as fief. (The narrator Ibn al-Mutawakkil said: which was in Ma'arib.)
So he assigned it to him as…
Narrated Shumair:
that Abyad bin Hammal visited the Messenger of Allah (ﷺ) who asked him to set aside a reserve of salt(a mine). So he reserved it for him. As he was turning away, a man in the gathering said: "Do you kno…