Matthew 16:11

⁹ Do you still not understand? Do you not remember the five loaves for the five thousand, and how many basketfuls you gathered?

¹⁰ Or the seven loaves for the four thousand, and how many basketfuls you gathered?

How do you not understand that I was not telling you about bread? But beware of the leaven of the Pharisees and Sadducees.”

¹² Then they understood that He was not telling them to beware of the leaven used in bread, but of the teaching of the Pharisees and Sadducees.

¹³ When Jesus came to the region of Caesarea Philippi, He questioned His disciples: “Who do people say the Son of Man is?”

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB: How do you not understand that I was not telling you about bread? But beware of the leaven of the Pharisees and Sadducees.”
KJV: How is it that ye do not understand that I spake it not to you concerning bread, that ye should beware of the leaven of the Pharisees and of the Sadducees?
WEB: How is it that you don’t perceive that I didn’t speak to you concerning bread? But beware of the yeast of the Pharisees and Sadducees.”
ASV: How 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.
DARBY: How do ye not understand that [it was] not concerning bread I said to you, Beware of the leaven of the Pharisees and Sadducees?
BLB: How do you⁺ not perceive that I did not speak to you⁺ about loaves? But beware of the leaven of the Pharisees and Sadducees.”

ÅB: Kan dere ikke da skjønne at det ikke var brød jeg snakket med dere om? Men ta dere i vare for fariseernes og sadduseernes surdeig!»
OTB: Hvordan kan det være at dere ikke forstår at jeg ikke snakket til dere om brød? Men vær på vakt mot fariseernes og saddukeernes surdeig.”
B1930: Kan I da ikke skjønne at det ikke var om brød jeg talte til eder? Men ta eder i vare for fariseernes og sadduseernes surdeig!

Mark 8:21
Then He asked them, “Do you still not understand?”
Read in context
Mark 4:40
“Why are you so afraid?” He asked. “Do you still have no faith?”
Read in context
Matthew 16:6
“Watch out!” Jesus told them. “Beware of the leaven of the Pharisees and Sadducees.”
Read in context
Luke 12:56
You hypocrites! You know how to interpret the appearance of the earth and sky. Why don’t you know how to interpret the present time?
Read in context
John 8:43
Why do you not understand what I am saying? It is because you are unable to accept My message.
Read in context