Hebrews 5:12-13

12For when for the time ye ought to be teachers, ye have again need that [one] should teach you what [are] the elements of the beginning of the oracles of 1God, and are become such as have need of milk, [and] not of solid food.

13For every one that partakes of milk [is] unskilled in the word of righteousness, for he is a babe;