Bible Verses About Shepherds: Searching them out when lost and straying

As a shepherd's searching of his drove, In the day of his being in the midst of his scattered flock, so I do seek My flock, And have delivered them out of all places, Whither they have been scattered, In a day of cloud and thick darkness.

`What man of you having a hundred sheep, and having lost one out of them, doth not leave behind the ninety-nine in the wilderness, and go on after the lost one, till he may find it?

and having found, he doth lay it on his shoulders rejoicing,