Musannaf Ibn Abi Shayba 16:769

Abu Bakr narrated to us, he said: Ibn ‘Ulayyah narrated to us, from al-Zuhri, who heard Abu Salamah and Sulayman ibn Yasar informing from Abu Hurayrah, attributing it to the Prophet, may Allah bless him and grant him peace, he said: "The Jews and the Christians do not dye [their hair/beards], so differ from them."