Commentaries:
Barnes' Notes
But he knew there thoughts - He knew their thoughts - their dark, malicious designs - by the question, which they proposed to him, whether it was lawful to heal on the Sabbath-days (Matthew). In "reply" to their question, Jesus asked them whether they would not release a "sheep" on the Sabbath-day if it was fallen into a pit, and also asked "them" whether it was better to do good than to do evil on that day, implying that to "omit" to do "good" was, in fact, doing "evil."
Other Barnes' Notes entries containing Luke 6:8:
Matthew 12:9-13
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