You will find him in the Valley of Arana.
Said to Abdullah ibn Unays al-Juhani before sending him to kill Khalid ibn Sufyan al-Hudhali, the Hudhayl chieftain gathering a force to raid Madinah.
What does he look like?
When you see him, you shall feel more terrified than you have ever been at anybody's appearance.
When I saw him in the distance, I had never been as terrified of anybody's appearance as this man's. So I said, "Allah and His Messenger have spoken the truth."
Recalling the moment he sighted Khalid ibn Sufyan in the Valley of Arana.
This shall be the sign between me and you on the Day of Judgment.
Said as he gifted Abdullah ibn Unays a staff on his return.