Pulpit Commentary: "the shepherd, when he found the wanderer, did not bring it back to the old fold, or replace it with the rest of the flock, but apparently (ver. 6) brought it to his own home. This would seem to indicate that sinners whom Jesus has come to save, and whom he has saved, are placed in a better position than that from which they originally wandered. This gives us the clue to the angels' joy over the "found one" more than over those who were safe in the old ibid"