It is narrated from Hazrat Umm Habibah (may Allah be pleased with her) that once some people from Yemen came to the service of the Prophet (peace and blessings be upon him). The Prophet (peace and blessings be upon him) taught them the method of prayer, its Sunnahs and obligations. Then those people said: O Messenger of Allah! We make a drink from wheat and barley. The Prophet (peace and blessings be upon him) said: "The same one which is called «غبيراء» ?" The people replied: Yes! The Prophet (peace and blessings be upon him) said: "Do not drink it." Two days later, they mentioned the same thing again. The Prophet (peace and blessings be upon him) again asked: "The same one which is called «غبيراء» ?" This question and answer happened three times, and even while departing, the same question and answer took place. The people said that the people of Yemen will not leave it. The Prophet (peace and blessings be upon him) said: "Whoever does not leave it, cut off his neck."