It was reported from the Prophet ﷺ that Khosrau sent him a gift and he accepted it, and that the kings sent him gifts and he accepted them.
حدثنا علي بن سعيد الكندي حدثنا عبد الرحيم بن سليمان عن إسرائيل عن ثوير عن أبيه
عن النبي ﷺ أن كسرى أهدى له فقبل وأن الملوك أهدوا إليه فقبل منهم
[Its chain of transmission is daif]. Ahmad (1/96) also narrated it through the hadith of Israil, with the same wording. Thuwayr is daif, accused of holding Rafd views (Taqrib). There is also a report on this subject from Jabir [Ibn Adi in al-Kamil (6/2114)] with different wording, and its chain of transmission is extremely daif.