4:21a

Surely you heard of Him: The clause Surely you heard of Him expresses a strong assumption or a certainty: “I am sure you have heard of him….” This clause is similar to 3:2.

Him: The pronoun Him refers to Jesus.

and were taught in Him: The phrase taught in Him means “you were taught about him.” It is also a passive. If it would be more natural in your translation to make it active, you can say:

what your teachers taught you about him

4:21b

in keeping with the truth that is in Jesus: This clause means “⌊That which they taught you⌋ agrees with the true teaching(s) about Jesus.”

Here are some other ways to translate this clause:

just as the truth is in Jesus (NET Bible)
-or-
the truth that comes from him (New Living Translation (2004))

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