Ata' bin Dinar (may Allah have mercy on him) says that Sayyiduna Umar (may Allah be pleased with him) said: Do not learn the language of the non-Arabs, and do not enter upon the polytheists in their places of worship on the day of their festival, for the displeasure of Allah descends upon them.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجزية / 18861
The father of Sa'id bin Salamah heard Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) saying: Avoid the festival of the enemies of Allah.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجزية / 18862
Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) says: "Whoever builds in the lands of the non-Arabs, celebrates their Nayruz and Mihrajan festivals and imitates them until he dies in that state, will be gathered with them on the Day of Resurrection."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجزية / 18863
Abu al-Mughirah narrates from Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) that whoever builds in the lands of the non-Arabs, celebrates their Nayruz and Mihrajan festivals and imitates them until he dies in that state, will be gathered with them on the Day of Resurrection.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجزية / 18864
Muhammad bin Sirin says that gifts were brought to Sayyiduna Ali (may Allah be pleased with him) on the day of the festival. He asked: What is this? They said: O Commander of the Faithful, this is the day of the festival. He said: Make every day a "Fayruz". Abu Usamah said: He disliked even to say "Nayruz". The Shaykh says: This was only because of singling out one particular day, since the Shari'ah did not single it out.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجزية / 18865