Matthew 16:4-6

Young's Literal Translation

⁴ `A generation evil and adulterous doth seek a sign, and a sign shall not be given to it, except the sign of Jonah the prophet;' and having left them he went away.

⁵ And his disciples having come to the other side, forgot to take loaves,

⁶ and Jesus said to them, `Beware, and take heed of the leaven of the Pharisees and Sadducees;'