Do not backbite or find faults in others

"O you who have declared faith with your tongues, but faith has not yet entered your hearts! Do not backbite other Muslims or seek out their faults, for whoever seeks out their faults, Allah will seek out his faults and humiliate him even if he is in his house"

[S- Abu Dawood]

Allah's Mercy Prevails Over His Wrath

On the authority of Abu Hurayrah (may Allah be pleased with him), who said that the Messenger of Allah (peace and blessings of Allah be upon him) said:

"When Allah decreed the Creation He pledged Himself by writing in His book which is laid down with Him: 'My mercy prevails over my wrath.'"

Hadith Qudsi [Muslim (also by al-Bukhari, an-Nasa'i and Ibn Majah)]

Narated By Safwan bin Muhriz : A man asked Ibn 'Umar, "What did you hear Allah's Apostle saying regarding
An-Najwa (secret talk between Allah and His believing worshipper on the Day of Judgment)?" He said, "(The
Prophet said), "One of you will come close to his Lord till He will shelter him in His screen and say: Did you commit
such-and-such sin? He will say, 'Yes.' Then Allah will say: Did you commit such and such sin? He will say, 'Yes.'
So Allah will make him confess (all his sins) and He will say, 'I screened them (your sins) for you in the world, and
today I forgive them for you.'"

Volumn 008, Book 073, Hadith Number 096