1 Corinthians 3:2
I fed you with milk, not with solid food, for you were not then able to take it. No, and even now you are not able; you are still worldly.
John 16:12
I have still much to say to you, but you cannot bear it now.
1 Peter 2:2
like newly born infants, crave pure spiritual milk, so that you may be enabled by it to grow till you attain Salvation--
Hebrews 5:11-14
Now on this subject I have much to say, but it is difficult to explain it to you, because you have shown yourselves so slow to learn.
Treasury of Scripture Knowledge
Summary
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.
General references
Bible References
Fed
Hebrews 5:12
For whereas, considering the time that has elapsed, you ought to be teaching others, you still need some one to teach you the very alphabet of the Divine Revelation, and need again to be fed with 'milk' instead of with 'solid food.'
1 Peter 2:2
like newly born infants, crave pure spiritual milk, so that you may be enabled by it to grow till you attain Salvation--
General references
Mark 7:18
"What, do even you understand so little?" exclaimed Jesus. "Do not you see that there is nothing external to a man, which by going into a man, can 'defile' him,