‏اللباس والزينة‏ : Hadeeth No:5244 Jabir b. 'Abdullah reported that Abu Qubafa was led (to the andience of the Prophet) on the day of the Conquest of Mecca and his head and beard were white like hyssop, whereupon Allaah's Messenger (sallAllaahu alayhi wa sallam) said: Change it with something but avoid black....

‏الوصية : Hadeeth No:3995 This hadith has been narrated on the authority of Simak with the same chain of transmitters. But he did not mention:" It was then that one-third became permissible."...