I want to know if any one Muslim or kafir insult our prophet s.a.w in front of me what can I do if he do again and again insult can I kill him tell me??
There is no permission to harm anyone. Leave them to Allah where Allah said,
And as for those who malign God’s Apostle – grievous suffering awaits them [in the life to come]!” (Surat at-Tawba, 9:61 )