Albert Barnes on Acts 12:24

But the word of God grew, etc. Great success attended it. The persecutions had now ceased; and notwithstanding all the attempts which had been made to crush it, still the church increased and flourished. The liberation of Peter and the death of Herod would contribute to extend it. It was a new evidence of Divine interposition in behalf of the church; it would augment the zeal of Christians; it would humble their enemies; and fill those with fear who had attempted to oppose and crush the church of God.

(a) "grew" Col 1:6