Greeting a kaafir first

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Check below answers in case you are looking for other related questions:
Ruling on celebrating non-Muslim holidays and congratulating them
Is it permissible to grieve for a man who died as a disbeliever, because he will abide for ever in Hell?

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Related Answers:
How should a Muslim deal with his kaafir family?
Boycotting the products of kuffaar who are hostile towards Islam
Giving blood to a kaafir who is not hostile towards Islam and who is not in a state of war with us
Ruling on celebrating non-Muslim holidays and congratulating them
Is it permissible to grieve for a man who died as a disbeliever, because he will abide for ever in Hell?

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