A.T. Robertson Commentary Mark 7:6

"And he said unto them, Well did Isaiah prophesy of you hypocrites, as it is written, This people honoreth me with their lips, But their heart is far from me." — Mark 7:6 (ASV)

Well (καλως). Appositely here, but ironical sarcasm in verse 9. Note here "you hypocrites" (υμων των υποκριτων).