The Messenger of Allah ﷺ said, "Let the beards grow, trim the moustaches, change the color of your gray hair, and do not resemble the Jews and the Christians."
حدثنا يحيى بن إسحاق حدثنا أبو عوانة عن عمر بن أبي سلمة عن أبيه
أن رسول الله ﷺ قال أعفوا اللحى وخذوا الشوارب وغيروا شيبكم ولا تشبهوا باليهود والنصارى
No references are available.
Its chain of transmission is sahih. Amr bin Abu Salama bin Abdul-Rahman narrated from his father, and Abu Awana and Hushaym narrated from him. Abu Hatim said, "He is truthful, but not that strong," while others considered him reliable. He served as judge of Madinah, and Abdullah bin Ali killed him in Syria in the year 132.