Musannaf Ibn Abi Shayba 21:740

Waki’ narrated to us, from Sufyan, from Musa ibn Ubaydah, from Abu Bakr ibn Anas ibn Malik: He said: He had Magians working for him on his land, and he used to say to them, "May Allah lengthen your lives and increase your wealth," and they would rejoice at that.