SCRIPTURE COMMENTARY #20
But the angel said to him: "Fear not, Zachary, for thy prayer is heard: and thy wife Elizabeth shall bear thee a son. And thou shalt call his name John."
THE FAITHFULNESS OF GOD: His promise to Zachary: "Thy wife shall bear thee a son," was faithfully kept. The punishment of dumbness pronounced on Zachary, because of his doubt, was accompanied by the promise that his dumbness should cease on the day when all that the angel had foretold came to pass. This promise also was exactly fulfilled, for the moment Zachary asserted that the child's name was John, his tongue was loosed, and he was able once more to speak. The instant that he obediently executed the angel's command: "Thou shall call his name John," speech was restored to him.
[From 'A Practical Commentary on Holy Scripture' by Bishop Knecht, D.D.]
(1899 Douay-Rheims Bible)