[2:168] O people, eat of what is in the earth, lawful and wholesome; and follow not the steps of Satan; he is a manifest foe to you;
That which is forbidden, even if it is pleasing now, is contaminated in the end. That which is permitted, even if it is hateful now, is wholesome in the end. The pure and permitted is what one acquires while not forgetting the Real in the state of acquiring it.
It is said that that which is permitted is what the gatherer obtains for His sake and acquires while witnessing the Real in every state. Anything that causes you to forget the Real or disobey the Real is from the steps of Satan.