Is it permissible to say: "May God be in everyone's aid" in response to "May God be in your aid," and is there any عقدي (theological) prohibition in the word "كان" (was/is/may be) here?
There is no harm in saying, "May Allah be of assistance to all," as the intention behind it is supplication (du'a). It has been reported in the hadith: "And Allah is in the servant's assistance."
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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