While Peter was kept in prison, the church prayed fervently to God for him.

Peter therefore was kept in prison: but prayer was made without ceasing of the church unto God for him.
So Peter was kept in prison, but earnest prayer for him was made to God by the church.
Peter was therefore kept in prison, but constant prayer was offered to God for him by the church.
But while Peter was in prison, the church prayed very earnestly for him.
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So we can say with confidence,“The Lord is my helper;
I will not be afraid.
What can anyone do to me?”