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, give him the reward of a sacrificial slaughter for it on the Day of Resurrection.

Reference: Bukhari: 6361