1 The Pharisees also with the Sadducees came, and tempting desired Him that He would shew them a sign from heaven.
2 He answered and said unto them, “When it is evening, ye say, ‘It will be fair weather: for the sky is red.'”
3 “And in the morning, ‘It will be foul weather to day: for the sky is red and lowering.’ O ye hypocrites, ye can discern the face of the sky; but can ye not discern the signs of the times?”
4 “A wicked and adulterous generation seeketh after a sign; and there shall no sign be given unto it, but the sign of the prophet Jonas.” And He left them, and departed.
The Pharisees and Sadducees Demand Signs – (Matthew 16:1-4) KJV
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The Leaven of the Pharisees and Sadducees – (Matthew 16:5-12) KJV