Dyeing hair in early versus established Islam

17. Amīr al-mu’minīn, peace be upon him, was asked to explain the saying of the Messenger of Allāh: “Banish your old age (by hair-dye) and do not acquire resemblance to the Jews.” Amīr al-mu’minīn replied:

The Prophet (S) said this at a time when the religion was confined to a few, but now that its expanse has widened and it is firmly settled everyone is free in his action. [1]