For when for the time, &c.— The doctrines of Christ had been so long taught among the Jews, that they could not but understand the scriptures of the prophets, unless they were extremely obstinate, or careless and negligent. What the first principles, or the very elements of the oracles of God, were, appears from the next chapter, Hebrews 5:1-2 namely the plainest and clearest principles and doctrines contained in the divine revelation. "You have," says the apostle, "need even of those to be laid before you, rather than the deep things of Christ; that is, the doctrines which are suited to those who are mature in grace, or at least pressing after it." See on 1 Corinthians 3:1-2.
Related Commentaries of Hebrews 5:12
Hebrews 5:12
12 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.