Narrated An-Nu’man bin Bashir:- I heard Allah’s Apostle, Muhammad, Peace Be Upon Him, saying:- ‘Both legal and illegal things are evident, but in between them, there are doubtful (suspicious) things, and most people have no knowledge about them. So whoever saves himself from these suspicious things saves his religion and his honor. And whoever indulges in these suspicious things is like a shepherd who grazes (his animals) near the Hima (private pasture) of someone else, and at any moment, he is liable to get in it.

O people! Beware! Every king has a Hima, and the Hima of Allah on the earth is His illegal (forbidden) things.

Beware! There is a piece of flesh in the body. If it becomes good (reformed), the whole body becomes good, but if it gets spoiled, the whole body gets spoiled, and that is the heart. [Source:-‘Bukhari’ Volume 1 Book # 2 Number # 49]

“By time, mankind is in loss, except for those who truly believe (and worship Allah alone), and do righteous deeds, (performing that which is obligatory upon them and avoiding that which they are forbidden), and enjoin one another upon obedience to Allah and enjoin one another with patient perseverance (in facing harm and trials.”) [Source:-Surah al ‘Asr (103)]