"I saw the letter of 'Umar bin Al-Khattab to Abu Musa (in which he said): 'A caravan came to me from Ash-Sham carrying a thick black paint like the pitch that is daubed on camels. I asked them how long they cooked it, and they told me that they cooked it until it was reduced by two-third. So the bad two-third had gone, one-third to take away evil and one-third to take away the bad smell. So let those who are with you drink it."
Reference: Sunan an-Nasa'i 5716 In-book : Book 51, Hadith 178 English translation : Vol. 6, Book 51, Hadith 5719
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