“Whoever killed a person having a treaty with the Muslims, shall not smell the smell of Paradise though its smell is perceived from a distance of forty years.”

“Whoever killed a person having a treaty with the Muslims, shall not smell the smell of Paradise though its smell is perceived from a distance of forty years.”
The Kuffār wish us on our festivals. So can we wish or greet or co-operate with the Kuffār in celebrating their festivals?
Many modern day ‘Muslim’ speakers have adopted the approach of memorizing quotes from the scriptures of the disbelievers in order to debate them and they consider this a methodology to invite to Islam. Was this practice known to the Prophet ﷺ or his Companions? Imām Muqbil bin Hādī al-Wādiʿī answers.