'Sheep for the Slaughter' in the Bible

He was pressed, and he was afflicted, and he will not open his mouth: he was brought as a sheep for the slaughter, and as a sheep before his shearers being dumb and he will not open his mouth.

And thou, Jehovah, knew me: thou wilt see me, and thou didst try my heart with thee: pluck them out as sheep for the slaughter, and consecrate them to the day of slaughter.