Allah Almighty says: {So do not claim purity for yourselves, for He knows best who is truly righteous.} [Surat al-Najm: 32] Allah Almighty also says: {Blame is only on those who wrong people and transgress in the land without right. For such there will be a painful punishment.} [Surat al-Shūra: 42]
1589/1- ‘Iyād ibn Himār (may Allah be pleased with him) reported that the Messenger of Allah (may Allah’s peace and blessings be upon him) said: “Verily, Allah the Exalted revealed to me that you must be humble, so that no one oppresses another or boasts of himself before another.” [Narrated by Muslim]
Linguists said that oppression “Baghy” means transgression and aggression.
1) The virtue of humbleness between the believers is highlighted as it is a moral that is loved by Allah Almighty, and the successful is the one who is guided to what Allah Almighty loves.
2) Boastfulness and oppression are dispraised, being from the qualities of the wrongdoers.
1590/2- Abu Hurayrah (may Allah be pleased with him) reported that the Messenger of Allah (may Allah’s peace and blessings be upon him) said: “If a man says: ‘People are ruined,’ he himself will be the most ruined of them all.” [Narrated by Muslim]
The forbiddance applies to those who say this out of self-admiration and looking down upon others. This behavior is prohibited. However, when one says this out of his grief over people’s negligence of their religion, then he is not held sinful for that. This is how leading scholars, like Mālik ibn Anas, Al-Khattābi, Al-Humaydi, and others, explained the Hadīth. I have also explained it in my book Al-Adhkār.
1) It is forbidden to admire oneself and look down upon the others.
2) Speaking about the faults of people is a reason for spreading evildoing among them, because people imitate each other.