An individual inquired if it was permissible to wish non-Muslims on their religious holidays. For example, saying mubarak ho, etc.
Sayyidi wa sanadi Hazrat Mawlana Mohammad Taqi Usmani sahib db said;
“To make dua for barakah for them (on these occasions) is impermissible. However, wishing them prosperity and well being is fine. The word “congratulations” implies this second meanings and not the first. So it is permissible to congratulate them.”