Jami` at-Tirmidhi 1634

Narrated Shurahbil bin As-Samt: "O Ka'b bin Murrah! Relate (something) to is from the Messenger of Allah (ﷺ), and be cautious. He said: 'I heard the Prophet (ﷺ) say: "Whoever develops some gray hair in Islam, it shall be a light from him on the Day of Judgement." [Abu 'Eisa said:] There is something on this topic from Fadalah bin 'Ubaid and 'Abdullah bin 'Amr. The narration of Ka'b bin Murrah was reported like this from Al-A'mash, from 'Amr bin Murrah. This Hadith is been reported from Mansur, from Salim bin Abu Al-Ja'd, and he included a man between him and between Ka'b bin Murrah in the chain. He is called: "Ka'b bin Murrah," and he is called: "Murrah bin Ka'b Al-Bahzi," and the one known among the Companions of the Prophet (ﷺ) is Ka'b bin Murrah Al-Bahzi, he reported some Ahadith from the Prophet (ﷺ)