Question :
Some non-Muslims have joined us while performing Eid prayer. Is this permissible?
The Answer :
All perfect praise be to Allah, The Lord of The Worlds, and may His peace and blessings be upon our Prophet Mohammad and upon all his family and companions. There is no harm on you if non-Muslims have joined your prayer, and you aren`t permitted to stop them from doing so; rather, you should encourage them and bring them closer to Islam and Muslims since doing so could make them embrace Islam. However, their prayer is considered invalid since being a Muslim is among the key conditions for the validity of prayer. Nonetheless, this doesn`t mean that you stop them from praying with you, especially since some of them may have already embraced Islam, but haven`t declared that yet. If they are as such, their prayer is valid and they will be rewarded for it, with Allah`s permission. And Allah knows best.