They discussed this among themselves and concluded, "It is because we did not bring any bread."

Matthew 16:6
"Watch out!" Jesus told them. "Beware of the leaven of the Pharisees and Sadducees."

Matthew 16:8
Aware of their conversation, Jesus said, "You of little faith, why are you debating among yourselves about having no bread?

Matthew 21:25
What was the source of John's baptism? Was it from heaven or from men?" They deliberated among themselves and said, "If we say, 'From heaven,' He will ask, 'Why then did you not believe him?'

Mark 8:16
So they began to discuss with one another the fact that they had no bread.

Luke 24:15
And as they talked and deliberated, Jesus Himself came up and walked along with them.

And they reasoned among themselves, saying, It is because we have taken no bread.