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Dua for someone you have spoken ill to

O Allah, whomever of the believers I have abused, give him the reward of a sacrificial slaughter for it on the Day of Resurrection.

 
اللهُمَّ فأَيُّمَا مُؤْمِنٍ سَبَبْتُهُ فَاجْعَلْ ذَلِكَ لهُ قُرْبةً إليكَ يَوْمَ القِيَامةِ
 
Allaahumma fa’ayyumaa mu’minin sababtuhu faj’al thaalika lahu qurbatan ‘ilayka yawmal-qiyaamat
Al-Bukhari, cf. Al-Asqalani, Fathul-Bari