1 Corinthians 3:2
2 I fed you with tmilk, not solid food, for you were not ready for it. And even now you are not yet ready,
Hebrews 5:12–13
12 For though by this time you ought to be teachers, you need someone to teach you again the kbasic principles of the oracles of God. You need lmilk, not solid food, 13 for everyone who lives on milk is unskilled in the word of righteousness, since he is a mchild.