Allah Almighty says: {Do you enjoin righteousness upon people while you forget yourselves, even though you recite the Scripture? Do you not understand?} [Surat al-Baqarah: 44] Allah Almighty also says: {O you who believe, why do you say what you do not do? It is most loathsome to Allah that you say what you do not do.} [Surat as-Saff: 2-3] Allah Almighty also says that Shu‘ayb (Jethro) (peace be upon him) said to his people: {I do not want to go against what I am forbidding you} [Surat Hūd: 88]
1) Those who enjoin what is good and forbid what is evil, yet their actions contradict their words are threatened of receiving punishment by Allah and are hateful in His Sight.
2) Whoever does this is not complying with the way of the messengers (peace be upon them).
198/1- Abu Zayd Usāmah ibn Zayd ibn Hārithah (may Allah be pleased with him and his father) reported that he heard the Messenger of Allah (may Allah’s peace and blessings be upon him) saying: “A man will be brought on the Day of Resurrection and thrown into the fire, and his intestines will slip out and he will go around by them like a donkey goes around a millstone. The dwellers of Hell will gather around him and say, ‘O so-and-so, what is the matter with you? Did you not use to command us to do right and forbid us from doing wrong?’ He will reply, ‘Yes, I commanded you to do right but I did not do it myself, and I forbade you from doing wrong but I did it myself.’” [Narrated by Al-Bukhāri and Muslim]
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1) Highlighting the severe punishment of those who do not practice what they preach.
2) Description of the Fire and its denizens is an aspect of the unseen which the Prophet (may Allah’s peace and blessings be upon him) informed us about, thus it is obligatory to believe in the prophetic reports and hold them truthful.
3) Doing good and abandoning evil saves the person from entering the Fire.
4) One should start by reforming himself in terms of his words and actions according to the prophetic advice.