Misinterpreting His words in a literal sense, the disciples believed He was cautioning them against consuming the bread they had received from these groups, fearing they might become spiritually unclean by association. Since they realized they had neglected to bring more bread, they viewed His warning as a critique of their own oversight. They murmured among themselves, saying, ‘We have no bread.’ Yet, the Lord, aware of their thoughts, admonished them for their lack of understanding and faith. As Blessed Theophylact noted, their foolishness stemmed from forgetting how He had miraculously fed multitudes with just a few loaves, and their disbelief lay in doubting His ability to provide for them despite their lack of provisions.
He asked them, ‘What are you worried about, O you of little faith? Do you not understand? Are your hearts hardened? Do you not see with your eyes, nor hear with your ears, and do you not remember? When I broke five loaves for five thousand, how many baskets full of leftovers did you collect?’ They replied, ‘Twelve.’ ‘And when I broke seven loaves for four thousand, how many baskets of leftovers did you gather?’ They answered, ‘Seven.’ ‘Why do you fail to comprehend that I was not speaking about bread, but about the leaven of the Pharisees and Sadducees and Herodians?’ It then dawned on the witnesses of this miraculous provision that their focus should not have been on mere sustenance, but rather on steering clear of the erroneous teachings propagated by the Pharisees, Sadducees, and Herodians.