'Milk' in the Bible

I gave you milk to drink, not solid food, for you were not yet able [to eat it]. But now you are still not able,

Who ever serves as a soldier at his own expense? Who plants a vineyard and does not eat the fruit of it? Who shepherds a flock and does not drink from the milk of the flock?

For indeed, [although you] ought to be teachers {by this time}, you have need of someone to teach you again the beginning elements of the oracles of God, and {you have need of} milk, not solid food.

For everyone who partakes of milk [is] unacquainted with the message of righteousness, because he is an infant.

like newborn infants long for the unadulterated spiritual milk, so that by it you may grow up to salvation,