Listen to what the Permanent Committee of Senior Scholars, at the head of them at that time was Shaykh 'Abdul-'Aziz ibn Baaz (rahimahullah Ta'ala) said, regarding eating the food of the People of Book prepared for their celebrations.
Abu Hurairah (رضي الله عنه) narrated that The Prophet ﷺ said: "Whoever invites to guidance will be rewarded like those who follow him in the guidance are rewarded, and that will not decrease the reward of those who have followed him." [Collected by Imām Muslim]
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