Never because Jesus did not exist. Jesus was alive and still is. He is with you right now. Jesus mentioned about sheep in the book of New Testament. he compared us being sheep, and God/Jesus being the Shepard.
Depending upon which version of the Bible is consulted (Old Testament versus New testament) the estimate will vary between 140 and 240 times. The times "Hell" is mentioned, in contrast, is much more difficult to count.