The word depositad is the imperative form of depositar in the second person plural.
See the full depositar conjugation


Depositad en él toda ansiedad, porque él cuida de vosotros.
Cast all your anxiety on him because he cares for you.
Depositad vuestra confianza en el Señor y todo saldrá bien para vosotros.
Put your confidence in The Lord and all will come out well for you.
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