450. For one you have insulted
Narrated by Abu Huraira (RA), He heard the Prophet (ﷺ) say:
اَللَّهُمَّ فَأَيُّمَا مُؤْمِنٍ سَبَبْتُهُ فَاجْعَلْ ذَلِكَ لَهُ قُرْبَةً إِلَيْكَ يَوْمَ الْقِيَامَةِ
Allaahumma fa'ayyumaa mu'minin sababtuhu faj'al dhaalika lahu qurbatan 'ilayka yawmal-qiyaamah
O Allah, whomever of the believers I have abused, make it a means of gaining nearness to you on the Day of Resurrection.
Related Duas:
Seeking refuge from four things
If you see someone smiling
Protection from the Dajjal
Dua to one who says 'May Allah bless you'
For the one who asks Allah to forgive your sins
If anyone likes you for the sake of Allah
For the one that have been praised
Etiquette of praising a fellow Muslim
Forbiddance of ascribing things to omens
If someone does a good job for you