The companion (Angel) on the left lifts his pen for six hours for the Muslim slave that errs or sins. If this slave repents and seeks Allah’s forgiveness for that error or sin, the Angel does not record it. And if the slave does not ask Allah for forgiveness, the Angel records it once.
The Prophet ﷺ through Abu Umamah. Collected by At-Tabarani in Kabir (7667), Abu Na’eem in Hilya (6/124), Al-Bayhaqi in Shu’ib (6788). Shaykh Al-Albaani graded it (Hasan) in his Saheehah (1209)].
I saw during my night journey some men whose lips were being clipped with clippers of fire. I said, ‘Who are these people, Jibreel?’ He replied, ‘These are the people from your followers who gave sermons commanding the people with righteousness, yet forgetting to practice it themselves.
The Prophet (sallallaahu ‘alayhi wa sallaam). Source; Sharh us-Sunnah, al-Bayhaqee in Ash-Shu’ab, ibn Abee ad-Dunyaa and others