Matthew 16:1–12

And the Pharisees and Sadducees came, and trying him asked him to show them a sign from heaven. ²But he answered and said unto them, When it is evening, ye say, It will be fair weather: for the heaven is red. ³And in the morning, It will be foul weather to-day: for the heaven is red and lowering. Ye know how to discern the face of the heaven; but ye cannot discern the signs of the times. ⁴An 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. ⁵And the disciples came to the other side and forgot to take bread.

⁶And Jesus said unto them, Take heed and beware of the leaven of the Pharisees and Sadducees. ⁷And they reasoned among themselves, saying, We took no bread. ⁸And Jesus perceiving it said, O ye of little faith, why reason ye among yourselves, because ye have no bread? ⁹Do ye not yet perceive, neither remember the five loaves of the five thousand, and how many baskets ye took up? ¹⁰Neither the seven loaves of the four thousand, and how many baskets ye took up? ¹¹How is it that ye do not perceive that I spake not to you concerning bread? But beware of the leaven of the Pharisees and Sadducees. ¹²Then understood they that he bade them not beware of the leaven of bread, but of the teaching of the Pharisees and Sadducees.