What the Bible says about Gentiles, Inclusion of
(From Forerunner Commentary)
The older brother represents the Pharisaical attitude that resents God's interest in sinners—the same attitude in the early church that looked suspiciously at the inclusion of Gentiles. His self-righteousness manifests itself in jealousy and envy. Today, the elder son is like those who, in self-righteousness, shun brethren who do not live up to their standard of righteousness (Proverbs 20:6; Galatians 6:3; Titus 3:5). Such people do not realize that their self-righteousness is as the filthy rags of the prodigal son (Isaiah 64:6).
Martin G. Collins
Parables of Luke 15 (Part Three)