A man from (the tribe of) Jaishan, who are from Yemen, came and asked the Messenger of Allah said: "Every intoxicant is unlawful. Allah, the Mighty and Sublime, has promised the one who drinks intoxicants that He will give him to drink from the mud of Khibal." They said: "O Messenger of Allah, what is the mud of Khibal?" He said: "The sweat of the people of Hell," or he said: "The juice of the people of Hell."
Sunan an-Nasa'i Book 51, Hadith 171
← Previous Hadith 'Umar bin Al-Khattab went out t them and said: "I noticed the smell of drink on so-and-so, and he said that he had drunk At-Tila' (thickened juice of grapes). I am asking about what he drank. If it was an intoxicant I will flog him." So 'Umar bin Al-Khattab, may Allah be pleased with him, flogged him, carrying out the Hadd punishment in full.

Sunan an-Nasa'i Book 51, Hadith 170 Next Hadith → "I heard the Messenger of Allah say: 'That which is lawful is clear and that which is unlawful is clear, but between them there are matters which are doubtful.'" And sometimes he said: "But between them are matters that are not as clear. I will describe the likeness of that for you. Allah, the Mighty and Sublime, has a sanctuary and the sanctuary of Allah is that which He has forbidden. Whoever grazes around the sanctuary will soon transgress into the sanctuary. And whoever approaches a matter that is unclear, he will soon wind up in the sanctuary." And sometimes he said: "He will soon transgress, and indeed whoever mixes in doubt, he will soon cross into it."

Sunan an-Nasa'i Book 51, Hadith 172