The word reprendían is the imperfect form of reprender in the third person plural.
See the full reprender conjugation

reprender

Cuando los demás lo reprendían para que se detuviera, él levantaba su voz aún más.
When other people rebuked him to be quiet, he raised his voice even more.
Podíamos acostarnos solo en el tiempo especificado; de otro modo, nos reprendían y no nos permitían dormir.
We could go to bed only at the specified time; otherwise, we would be scolded and not allowed to sleep.
Y le presentaban niños para que los tocase; y los discípulos reprendían a los que los presentaban.
And they brought young children to him, that he should touch them: and his disciples rebuked those that brought them.
Mr 10:13 Y le presentaban niños para que los tocase; y los discípulos reprendían a los que los presentaban.
Mark 10:13 And they brought young children to him, that he should touch them: and his disciples rebuked those that brought them.
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