[Machine] He came to the Prophet ﷺ seeking his permission to use salt. The Prophet gave him permission, so he took some salt. Then a man said to him, "O Messenger of Allah, do you know what he cut from it? It is the water that remains after the process of boiling it until it evaporates. So he returned it to him and asked him what is protected from the flies. The Prophet said, "As long as it has not reached the width of camel's hooves."
أَنَّهُ وَفَدَ إِلَى النَّبِيِّ ﷺ يَسْتَقْطِعُهُ الْمِلْحَ فَأَقْطَعَهُ إِيَّاهُ فَقَالَ لَهُ رَجُلٌ يَا رَسُولَ اللهِ تَدْرِي مَا أَقْطَعْتَهُ الْمَاءَ الْعِدَّ فَأَرْجَعَهُ مِنْهُ وَسَأَلْتُهُ مَا يُحْمَى مِنَ الْأَرَاكِ؟ قَالَ «مَا لَمْ تَبْلُغْهُ أَخْفَافُ الْإِبِلِ»