The word amonestan is the present form of amonestar in the third person plural.
See the full amonestar conjugation
¿No había nadie que lo amonestan?
Was there no one to admonish him?
Os rogamos, hermanos, que reconozcáis a los que trabajan entre vosotros, y os presiden en el Señor, y os amonestan;
And we beseech you, brethren, to know them which labour among you, and are over you in the Lord, and admonish you;
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