Ephesians 4:21

εἴγε αὐτὸν ἠκούσατε καὶ ἐν αὐτῷ ἐδιδάχθητε, καθώς ἐστιν ἀλήθεια ἐν τῷ Ἰησοῦ·

eige ayton ēkoysate kai en aytō edidachthēte, kathōs estin alētheia en tō Iēsoy·

King James Version (KJV)

If so be that ye have heard him, and have been taught by him, as the truth is in Jesus:

Modern English

when you heard about Christ and were taught in him in accordance with the truth that is in Jesus.