Riyad as-Salihin (The Meadows of the Righteous)
by Imam Nawawi
1635. Ibn 'Umar reported that the Messenger of Allah, may Allah bless him and grant him peace, said, "None of you should eat with his left hand nor drink with it. Shaytan eats with his left hand and drinks with it." [Muslim]
What is meant is dyeing white hair and the beard yellow or red, Black is forbidden as will be mentioned.