Matthew 16:11

“How is it that ye do not understand, etc.] That you should be so senseless and void of thought, after such instances, as to imagine, that I concerned myself about what bread you brought with you; one would think you could not but know, that I spake it not to you concerning bread, taken in a literal sense; but must be thought to speak figuratively and mystically, and to have an higher sense and meaning, when I said to you, that ye should beware of the leaven of the Pharisees, and of the Sadducees; how could you think that I had any regard to the leaven taken in a literal sense, the Pharisees and Sadducees approve or disapprove of?”

“The account in these verses is also recorded in Mark 8:13-21. Matthew 16:5 And when his disciples were come to the other side - That is, to the other side of the Sea of Galilee. Mark says that he entered into a ship again, and departed to the other side. The conversation with the Pharisees and Sadducees had been on the western side of the Sea of Galilee. See the notes at Matthew 15:39. They crossed from that side again to the east. Had forgotten to take bread - That is, had forgotten to lay in a sufficient supply. They had, it seems, not more than one loaf, Mark 8:14. Matthew 16:6-11 Take heed ... - That is, be cautious, be on your guard. The leaven of the Pharisees and Sadducees - Leaven is…”

“How do ye not understand - Beside, do you not understand, that I did not mean bread, by the leaven of the Pharisees and Sadducees? Matthew 16:13”

“16:11-12 Yeast is often a symbol of sin and evil (see Exod 12:8, 15; Lev 6:16-17; Gal 5:9); here it indicates the permeating nature of the deceptive teaching.”

“Mar 4:40, Mar 8:21; Luk 12:56; Joh 8:43 Matthew 16:12”