عن أبي هريرة، قال: قال رسول الله صلى الله عليه وسلم: أيها الناس، إن الله طيب لا يقبل إلا طيبا، وإن الله أمر المؤمنين بما أمر به المرسلين، فقال: يا أيها الرسل كلوا من الطيبات واعملوا صالحا، إني بما تعملون عليم وقال: يا أيها الذين آمنوا كلوا من طيبات ما رزقناكم . ثم ذكر الرجل يطيل السفر أشعث أغبر، يمد يديه إلى السماء، يا رب، يا رب، ومطعمه حرام، ومشربه حرام، وملبسه حرام، وغذي بالحرام، فأنى يستجاب لذلك؟ (مسلم رقم 1015)
Hadhrat Abu Hurayrah (Radhiyallahu Anhu) reports that Rasulullah (Sallallahu Alaihi Wasallam) said: “O people, indeed Allah Ta’ala is Pure and accepts only that which is pure. Allah Ta’ala has commanded the believers with the same command that He gave to the Ambiyaa (Alayhimus Salaam). (In regard to the Ambiyaa (Alayhimus Salaam)), Allah Ta’ala has said: “O Messengers, consume that which is pure and wholesome and perform righteous actions. Indeed I am all aware with what you do.” (In regard to the believers), Allah Ta’ala has mentioned: “O believers, consume from the pure and wholesome foods that We have provided for you." Thereafter, Rasulullah (Sallallahu Alaihi Wasallam) explained the condition of a person who had undertook a long, arduous journey. His hair was dishevelled and his clothing was covered in dust. He raised his hands to the sky crying in supplication saying, “O my Lord, O my Lord (Help me in my difficulty)." Whereas his food and drink intake are haraam, his clothing is obtained from haraam sources; his body is nourished with haraam, so how can his duaas ever be answered?” (i.e. Despite being in this pitiable plight and condition, his duaas are not answered).