Commentaries:
Robertson's Word Pictures (NT)
Whereby (kata ti). According to what. It was too good to be true and Zacharias demanded proof and gives the reason (for, gar) for his doubt. He had prayed for this blessing and was now sceptical like the disciples in the house of Mary about the return of Peter (Acts 12:14 f.).
Other Robertson's Word Pictures (NT) entries containing Luke 1:18:
Luke 1:7
Philemon 1:9
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