Mark 8:16-19

But the disciples had no clue what Jesus was talking about, so they began to discuss it among themselves, saying, “Is he saying this because we forgot to bring bread?” Knowing what they were thinking, Jesus said to them, “Why all this fussing over forgetting to bring bread? Do you still not see or understand what I say to you? Are your hearts still hard? You have good eyes, yet you still don’t see, and you have good ears, yet you still don’t hear, neither do you remember. When I multiplied the bread to feed more than five thousand people, how many baskets full of leftovers did you gather afterward?” “Twelve,” they replied.