Whom shall he teach knowledge? and whom shall he make to understand doctrine? them that are weaned from the milk, and drawn from the breasts.
Isaiah 28:9
As newborn babes, desire the sincere milk of the word, that ye may grow thereby
1 Peter 2:2
For when for the time ye ought to be teachers, ye have need that one teach you again which be the first principles of the oracles of God; and are become such as have need of milk, and not of strong meat.
Hebrews 5:12