Faulting others for what they have repented from can reflect the sin on oneself.
The Softest Hearts
It is reported that Makḥūl – Allāh have mercy on him – said, “The people with the softest hearts are those who sin the least.”
Abū Nu’aym, Ḥilyah Al-Awliyā` Vol. 2 p344. It is reported that ‘Awn b. ʿAbdillāh, the ascetic and jurist, said, “Sit with the repentant, for they have the softest hearts.” Abū Nu’aym, Ḥilyah Al-Awliyā` Vol. 2 p192.
Abū Nu’aym, Ḥilyah Al-Awliyā` Vol. 2 p192.
Also read
Related sayings.
Finding faults with others whilst not taking care of oneself is a sign of defective iman.
Ibn Masud on what truthfulness and lying lead to.