Abu Huraira (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) said: "O people! Allah is pure and accepts only that which is pure, and Allah has given the same command to the believers as He gave to the messengers. Allah Almighty said: O messengers! Eat of the good things and do righteous deeds; surely I am aware of what you do (: Al-Mu’minun 23:51), and He also said: O believers! Eat of the good things We have provided for you, and give thanks to Allah if it is Him you worship (: Al-Baqarah 2:172)." The narrator said: Then the Prophet (peace and blessings be upon him) mentioned a man "who undertakes a long journey, his hair disheveled and covered with dust, then he raises his hands towards the sky and says: O Lord, O Lord, while his food is unlawful, his clothing is unlawful, his drink is unlawful, and he is nourished with unlawful things, so how can his supplication be accepted?"