Sahih Muslim

Abu Huraira reported Allah's Messenger (ﷺ) as saying:O people, Allah is Good and He therefore, accepts only that which is good. And Allah commanded the believers as He commanded the Messengers by saying: ""O Messengers, eat of the good things, and do good deeds; verily I am aware of what you do"" (xxiii. 51). And He said: ""O those who believe, eat of the good things that We gave you"" (ii. 172). He then made a mention of a person who travels widely, his hair disheveled and covered with dust. He lifts his hand towards the sky (and thus makes the supplication): ""O Lord, O Lord,"" whereas his diet is unlawful, his drink is unlawful, and his clothes are unlawful and his nourishment is unlawful. How can then his supplication be accepted?