Indeed:
If a Muslim were to sell them something they would fashion into a cross, or palm-branches for their procession, or the like, he would be selling them what they will use to carry out the very act of sin.
Those who uphold the view of prohibition reply that the symbols of disbelief—its emblems and identifying marks—are of two kinds:
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A kind we are commanded to maintain in the religion of Islam: anything that humiliates disbelief and lowers it. When they adopt such a mark, helping them in it is assistance in what God and His Messenger have ordered—for we command them, for instance, to wear distinguishing garments (ghiyār).
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A kind we are forbidden: anything that exalts disbelief and makes it manifest, such as raising their voices with their scripture, displaying palm-branches, selling them church bells, selling them banners and standards, and the like. These are rites of disbelief that we have been ordered to remove and prevent within Muslim lands, so it is not permissible to assist them in them.
Accepting a gift from the People of the Pact on their festival
As for accepting a gift from them on the day of their festival, we have already cited that ʿAlī—may Allah be pleased with him—was presented with a Nowruz gift and accepted it.
Ibn Abī Shaybah reports in his Muṣannaf: “Jarīr narrated to us, from Qābūs, from his father, that a woman asked ʿĀʾishah, saying, ‘We have …’”