1 Corinthians 3:1

And I, brethren, could not speak unto you as unto spiritual, but as unto carnal, even as unto babes in Christ.

2 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.

3 For ye are yet carnal: for whereas there is among you envying, and strife, and divisions, are ye not carnal, and walk as men?

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB
Brothers, I could not address you as spiritual, but as worldly—as infants in Christ.
KJV
And I, brethren, could not speak unto you as unto spiritual, but as unto carnal, even as unto babes in Christ.
WEB
Brothers, I couldn’t speak to you as to spiritual, but as to fleshly, as to babies in Christ.
ASV
And I, brethren, could not speak unto you as unto spiritual, but as unto carnal, as unto babes in Christ.
DARBY
And *I*, brethren, have not been able to speak to you as to spiritual, but as to fleshly; as to babes in Christ.
BLB
And I, brothers, was not able to speak to you⁺ as to spiritual but as to fleshly—as to infants in Christ.
ÅB
Og jeg, brødre, kunne ikke tale til dere som til åndelige, men bare som til kjødelige, som til småbarn i Kristus.
OTB
Og jeg, brødre og søstre, kunne ikke tale til dere som åndelige mennesker, men som de som er verdslige, som spedbarn i Kristus.
B1930
Og jeg, brødre, kunde ikke tale til eder som til åndelige, men bare som til kjødelige, som til småbarn i Kristus.

Study notes (Tyndale)

Original text and word study

Cross references