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Matthew 16:9-11
9
do ye not yet understand, nor remember the five loaves of the five thousand, and how many hand-baskets ye took up?
10
nor the seven loaves of the four thousand, and how many baskets ye took up?
11
how do ye not understand that I did not speak to you of bread -- to take heed of the leaven of the Pharisees and Sadducees?'
Luke 24:25
And he said unto them, 'O inconsiderate and slow in heart, to believe on all that the prophets spake!
Hebrews 5:12
for even owing to be teachers, because of the time, again ye have need that one teach you what [are] the elements of the beginning of the oracles of God, and ye have become having need of milk, and not of strong food,