Dua 1
When, out of human nature, he became angry with someone and said harsh words about him, he would then make this supplication for him:
اَللّٰهُمَّ فَاَيُّمَا مُؤْمِنٍ سَبَبْتُهٗ فَاجْعَلْ ذٰلِكَ لَهٗ قُرْبَةً اِلَيْكَ يَوْمَ الْقِيَامَةِ
O Allah! Any believer whom I have insulted, make that a means of nearness to You for him on the Day of Resurrection.
Sahih al-Bukhari, no. (6361), the wording is his, Sahih Muslim, no. (2601).
The wording of Muslim also has: “Make it purification and mercy for him.”