luke 15:7 I say unto you, that likewise joy shall be in heaven over one sinner that repenteth, more than over ninety and nine just persons, which need no repentance. - Free Bible Online

      7. ninety-nine just . . . needing no repentance--not angels, whose place in these parables is very different from this; but those represented by the prodigal's well-behaved brother, who have "served their Father" many years and not at any time transgressed His commandment (in the outrageous sense of the prodigal). (See on Lu 15:29; Lu 15:31). In other words, such as have grown up from childhood in the fear of God and as the sheep of His pasture. Our Lord does not say "the Pharisees and scribes" were such; but as there was undoubtedly such a class, while "the publicans and sinners" were confessedly the strayed sheep and the prodigal children, He leaves them to fill up the place of the other class, if they could.

JFB.