The ruling on dyeing with anything other than black in order to differ from the Jews and Christians

Question:
He says: In his statement (peace and blessings be upon him), “The Jews and Christians do not dye their hair, so differ from them,” and differing from the Jews and Christians is obligatory. So, does this make dyeing with anything other than black obligatory?

Answer:
It is not obligatory, for two reasons. First, some of the Companions, among their most distinguished, did not dye their hair and left their beards white. This indicates that the command is not for obligation. This shifts the command from obligation to recommendation. This is the first answer. The second answer is as Shaykh al-Islam Ibn Taymiyyah stated in his book.
*Iqtida' al-Sirat al-Mustaqim* (The Straight Path). Differing from the disbelievers is of two types. Differing from them in what they have innovated in their actions; this type of differing is obligatory. As for differing from them in something they did not innovate, but which is part of their creation, such as gray hair, it is disliked to imitate them in this, but it is not forbidden. There is a difference between the two types of imitating the disbelievers. If it is from their actions, you must differ from them. If it is not from their actions, it is disliked to imitate them, and it is recommended to differ from them. Gray hair is not from their actions. Yes.