G2727–κατηχέω–katēcheō

that you might know the certainty concerning the things in which you were instructed.

κατηχήθης katēchēthēs “you were instructed”

This man had been instructed in the way of the Lord; and being fervent in spirit, he spoke and taught accurately the things concerning Jesus, although he knew only the baptism of John.

κατηχημένος katēchēmenos “instructed”

They have been informed about you, that you teach all the Jews who are among the Gentiles to forsake Moses, telling them not to circumcise their children neither to walk after the customs.

κατηχήθησαν katēchēthēsan “They have been informed”

Take them, and purify yourself with them, and pay their expenses for them, that they may shave their heads. Then all will know that there is no truth in the things that they have been informed about you, but that you yourself also walk keeping the law.

κατήχηνται katēchēntai “they have been informed”

and know his will, and approve the things that are excellent, being instructed out of the law,

κατηχούμενος katēchoumenos “being instructed”

However in the assembly I would rather speak five words with my understanding, that I might instruct others also, than ten thousand words in another language.

κατηχήσω, katēchēsō “I may instruct,”

But let him who is taught in the word share all good things with him who teaches.

κατηχούμενος katēchoumenos “being taught”κατηχοῦντι katēchounti “teaching”