Albert Barnes Commentary Matthew 16:4

"An evil and adulterous generation seeketh after a sign; and there shall no sign be given unto it, but the sign of Jonah. And he left them, and departed." — Matthew 16:4 (ASV)

A wicked and adulterous generation, etc. (See Barnes on Matthew 12:38-40).

Mark adds (Mark 8:12) that he sighed deeply in spirit. He did not say this without feeling; he was greatly affected by their perverseness and obstinacy (Matthew 16:6–12). This account is also recorded in Mark 8:14-21.