Commentaries:
Robertson's Word Pictures (NT)
An evil and adulterous generation (genea ponhra kai moixaliv). They had broken the marriage tie which bound them to Jehovah (Plummer). See Psalms 73:27; Isaiah 57:3 ff.; Isaiah 62:5; Ezekiel 23:27; James 4:4; Revelation 2:20. What is "the sign of Jonah?"
Other Robertson's Word Pictures (NT) entries containing Matthew 12:39:
Matthew 16:4
Mark 8:12
Luke 11:29
Romans 7:3
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