Matthew 16:1-6

1 The Pharisees and the Sadducees came to tempt him; they asked him to show them a sign from the heaven.
2 But he answered and said unto them, When it is evening, ye say, It will be fair weather, for the heaven is glowing with an aurora.
3 And in the morning, It will be foul weather today, for the heaven has an aurora and is cloudy. O ye hypocrites, ye know how to make decisions based on the face of the heaven, and regarding the signs of the times are ye unable?
4 A wicked and adulterous generation seeks after a sign; and no sign shall be given unto it, but the sign of the prophet Jonah. And he left them and departed.
5 And when his disciples were coming from the other side, they had forgotten to take bread.
6 Then Jesus said unto them, Take heed and keep yourselves from the leaven of the Pharisees and of the Sadducees.
The Jubilee Bible (from the Scriptures of the Reformation), edited by Russell M. Stendal, Copyright © 2000, 2001, 2010