1 Corinthians 3:2

I fed you with milk, not with meat; for you weren't yet ready. Indeed, not even now are you ready,

John 16:12

"I have yet many things to tell you, but you can't bear them now.

1 Peter 2:2

as newborn babies, long for the pure milk of the Word, that you may grow thereby,

Hebrews 5:11-14

About him we have many words to say, and hard to interpret, seeing you have become dull of hearing.

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 although by this time you should be teachers, you again need to have someone teach you the rudiments of the first principles of the oracles of God. You have come to need milk, and not solid food.
1 Peter 2:2
as newborn babies, long for the pure milk of the Word, that you may grow thereby,

General references

Mark 7:18
He said to them, "Are you thus without understanding also? Don't you perceive that whatever goes into the man from outside can't defile him,