Matthew 16:5

How had they no bread, seeing that as soon as they had filled seven baskets they entered into the boat, and came into the parts of Magedan? There they hear that they ought to take heed of the leaven of the Pharisees and Sadducees. But the Scripture is witness that they had forgotten to take the baskets with them.

They were bound to their Master with so great affection, that they were unwilling to part from Him for even a moment of time. And herein it should be observed how far they were from any longing for delicacies, when they took so small care for necessaries, that they had even forgotten to take bread, without which human weakness cannot support itself. He said unto them, Take heed and beware of the leaven of the Pharisees; and of the Sadducees.

(Verse 5.) And leaving them, he went away, and when his disciples had come across the sea, they forgot to take bread. He said to them: Leaving behind the scribes and Pharisees, to whom he had said, An evil and adulterous generation seeks a sign, and a sign will not be given to it, except the sign of Jonah the prophet, he went over the sea correctly, and he followed the peoples of the Gentiles. But what the sign of Jonah means, has already been said above.