Here are 13 Bible verses about spiritual immaturity from the Old and New Testaments of the Holy Bible (King James Version), sorted from most to least relevant.
1 Corinthians 3:2 KJV
I have fed you with milk, and not with meat: for hitherto ye were not able to bear it, neither yet now are ye able.
Hebrews 5:12 KJV
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.
1 Peter 2:2 KJV
As newborn babes, desire the sincere milk of the word, that ye may grow thereby:
Galatians 4:2 KJV
But is under tutors and governors until the time appointed of the father.
Revelation 3:8 KJV
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1 Corinthians 3:1 KJV
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1 Corinthians 3:3 KJV
For ye are yet carnal: for whereas there is among you envying, and strife, and divisions, are ye not carnal, and walk as men?
1 Corinthians 14:20 KJV
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Ephesians 4:14 KJV
That we henceforth be no more children, tossed to and fro, and carried about with every wind of doctrine, by the sleight of men, and cunning craftiness, whereby they lie in wait to deceive;
Hebrews 5:11-14 KJV
Of whom we have many things to say, and hard to be uttered, seeing ye are dull of hearing. 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. For every one that useth milk is unskilful in the word of righteousness: for he is a babe. But strong meat belongeth to them that are of full age, even those who by reason of use have their senses exercised to discern both good and evil.
Galatians 4:1 KJV
Now I say, That the heir, as long as he is a child, differeth nothing from a servant, though he be lord of all;
Galatians 4:3 KJV
Even so we, when we were children, were in bondage under the elements of the world:
Proverbs 9:6 KJV
Forsake the foolish, and live; and go in the way of understanding.