Maliks Muwatta Book 42, Hadith Number 1.

Yahya related to me from Malik from Ibn Shihab that as-Sa’ib ibn Yazid informed him that Umar ibn al-Khattab came out to them. He said, “I have found the smell of wine on so-and-so, and he claimed that it was the drink of boiled fruit juice, and I am inquiring about what he has drunk. If it intoxicates, I will flog him.” Umar then flogged him with the complete hadd.