Musannaf Ibn Abi Shaybah

It is narrated from Hazrat Hudhail bin Shurahbeel. He says that Hazrat Umar bin Khattab passed by the tribe of Banu Thaqif, so he asked them for water. They said among themselves, "Hide your nabidh and give him water to drink." Upon this, Hazrat Umar said, "O group of Thaqif! Give me some of your nabidh to drink." The narrator says, so they gave him nabidh to drink. Hazrat Umar ordered a servant, who added water to it, then he (Umar) stopped him with his own hand. Then he said, "O group of Thaqif! You drink this strong drink. So, whoever among you is put in doubt by it to any degree, he should break it with water."