Premanand Maharaj Ji
I wrongly criticised a devotee. How do I seek forgiveness?
Seek forgiveness from the devotee you criticised
Criticising a devotee brings downfall in time, so never dare to do it. If it happens by mistake, ask that devotee's forgiveness.
Criticising a devotee will in time bring about your downfall. You will be able to keep neither the Vaishnava spirit nor worldly life.