Commentaries:
Robertson's Word Pictures (NT)
Shall do and teach (poihsh kai didach). Jesus puts practice before preaching. The teacher must apply the doctrine to himself before he is qualified to teach others. The scribes and Pharisees were men who "say and do not" (Matthew 23:3), who preach but do not perform. This is Christ's test of greatness.
Other Robertson's Word Pictures (NT) entries containing Matthew 5:19:
Matthew 7:26
Matthew 22:36
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