Shaikh Abdul-Muhsin al-Abbaad was asked:
Is it allowed to eat the food of the people of innovation knowing that they made this food for this innovation, like the innovation of Mawlid an-Nabawi?
“What is obligatory is to notify them to stay away from innovations and to leave off unlawful affairs. It is upon a person not to eat the food which was made for innovated and unlawful affairs”.
[Sharh Sunan Abi Dawood no. 137]
Faisal Ibn Abdul Qaadir Ibn Hassan