Abu al-Huwayrith says that the Prophet (peace and blessings be upon him) fixed one dinar per year on a Christian of Makkah (who was called Mawhab), and the Prophet (peace and blessings be upon him) fixed 300 dinars per year on the Christians of Aylah, and he stipulated "hosting for three days" the Muslims who passed by them, and that "they would not cheat any Muslim."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجزية / 18678