During his Olivet discourse, Jesus tells His disciples of the coming day of judgment when He shall separate the sheep from the goats:
31When the Son of Man comes in His glory, and all the holy angels with Him, then He will sit on the throne of His glory. 32All the nations will be gathered before Him, and He will separate them one from another, as a shepherd divides his sheep from the goats. 33And He will set the sheep on His right hand, but the goats on the left.