As-salam-alaikum & welcome to the new food guide section provided by the Gloucester Islamic Academy
There are numerous Qur'anic verses and Ahaadith of our beloved Rasulullah (sallallahu alaihi wasallam) expounding the importance of consuming Halaal food and warning against Haraam. Almighty Allah (SWT) says, "O people of Imaan! Eat of the pure things (Halaal) that We have provided for you, and be grateful to Allah" (Surah Baqarah 2:172)
Our Beloved Nabi (sallallahu alaihi wasallam) has said, "There will come a time upon my Ummat when people will not be concerned over what they take. It will not matter for them whether it is Haraam or Halaal" (Bukhari: Nasai).
It is further reported that, "When this time comes, then none of their Duas will be accepted" (Razeen). It is narrated in another Hadith, "It is better for you to consume sand rather than eating anything Haraam" (Ahmed). It is narrated in another Hadith, "That flesh which has grown out of Haraam food will not enter Jannah. Hell has more right to it" (Ahmad: Tirmidhi).
Haraam food has a detrimental effect on one's spiritual development. It has a direct effect on one's actions. One who consumes Haraam will not feel any enthusiasm to perform good deeds and it will lead him/her towards sinful deeds. Haraam also acts as a barrier such that duaas are not accpeted.
On the authority of Abu Huraira (R.A) who said, The Messenger of Allah (sallallahu alaihi wasallam) said, "Allah, the Almighty is pure and accepts only that which is pure. Allah has commanded the faithful to do that which he commanded the messengers, and the Almighty has said, 'O Messengers! Eat of the pure things, and do righteous actions'. And Allah the Almighty has said: "O` you who believe! Eat of the pure things wherewith we have provided you." Then he mentioned (the case of) a man who, having journeyed far, is disheveled and dusty and who spreads out his hands to the sky (saying): O' Lord! -- While his food is unlawful, his drink unlawful, and he is nourished unlawfully, so how can his supplication be answered!" (Muslim)