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 a fief. When he returned, a man in the meeting asked: Do you know what you have assigned him as a fief? You have assigned him the perennial spring water. So he took it back from him. He asked him about protecting land which had arak trees growing in it. He replied: He could have such as was beyond the region where the hoofs (of camels) went. The narrator Ibn al-Mutwakkil said: "that is the camel hoofs." (Using translation from Abū Dāʾūd 3064)
أَنَّهُ وَفَدَ إِلَى النَّبِيِّ ﷺ فَاسْتَقْطَعَهُ الْمِلْحَ قَالَ ابْنُ الْمُتَوَكِّلِ الَّذِي بِمَأْرِبَ فَقَطَعَهُ لَهُ فَلَمَّا أَنْ وَلَّى قَالَ رَجُلٌ مِنَ الْمَجْلِسِ أَتَدْرِي مَا قَطَعْتَ لَهُ إِنَّمَا قَطَعْتَ لَهُ الْمَاءَ الْعِدَّ قَالَ فَانْتُزِعَ مِنْهُ قَالَ وَسَأَلْتُهُ عَمَّا يُحْمَى مِنَ الْأَرَاكِ قَالَ مَا لَمْ تَنَلْهُ خِفَافٌ وَقَالَ ابْنُ الْمُتَوَكِّلِ أَخْفَافُ الْإِبِلِ