Matthew 13:34-35 Jesus spoke all of these things to the multitudes in parables; and without a parable He was not speaking to them:

Godbey⁽ⁱ⁾ ³⁴ Jesus spoke all of these things to the multitudes in parables; and without a parable He was not speaking to them: ³⁵ in order that the word spoken by Isaiah, the prophet, saying, I will open my mouth in parables: I will make known the things which have been hidden from the foundation.