'Umar b. Al-Khaṭṭāb رضي الله عنه said:
“If you see that someone has slipped, correct him, pray for him & don't help Shaytaan against him (by insulting him).”
[Tafseer al-Qurtubi, v. 15, p. 256]
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Musa (alayhissalam) used to often say in his Du'a:
اللَّهُمَّ لَيْنَ قَلْبِي بِالتَّوْبَةِ ، وَلَا تَجْعَلْ قَلْبِي قَاسِيًا كَالْحَجَرِ
Oh Allah, soften my heart with tawbah (repentance), and do not make my heart hard as a rock.
[Ibn Rajab al-Hanbali (rahimahullah) in Jami' al-Uloom wal Hikam, no. 326 or 20/437]
