And Zacharias said to the angel Next follows the doubt of Zacharias, and the punishment which the Lord inflicted on his unbelief. He had prayed that he might obtain offspring, and now that it is promised, he distrusts, as if he had forgotten his own prayers and faith. It might, at first sight, appear harsh that God is so much offended by his reply. He brings forward his old age as an objection. Abraham did the same; and yet his faith is so highly applauded that Paul declares, he "considered not his own body now dead, neither yet the deadness of Sarah's womb," (Romans 4:19) but unhesitatingly relied on the truth and power of God. Zacharias inquires how, or by what proof, he might arrive at certainty. But Gideon was not blamed for twice asking a sign, (Judges 6:17, 37, 39.) Nay more, we are shortly after this informed of Mary's objection, How shall this be, since I know not a man? (ver. 34,) which the angel passes over as if it contained nothing wrong. How comes it then that God punishes Zacharias so severely, as if he had been guilty of a very heinous sin? I do acknowledge that, if the words only are considered, either all were equally to blame, or Zacharias did nothing wrong. But as the actions and words of men must be judged from the state of the heart, we ought rather to abide by the judgment of God, to whom the hidden secrets of the heart are naked and opened, (Hebrews 4:13.) Unquestionably, the Lord beheld in Zacharias something worse than his words may bear, and therefore his anger was kindled against him for throwing back with distrust the promised favor. We have no right, indeed, to lay down a law to God which would not leave him free to punish in one the fault which he pardons in others. But it is very evident that the case of Zacharias was widely different from that of Abraham, or Gideon, or Mary. This does not appear in the words; and therefore the knowledge of it must be left to God, whose eyes pierce the depths of the heart. Thus God distinguishes between Sarah's laugh (Genesis 18:12) and Abraham's, (Genesis 17:17,) though the one apparently does not differ from the other. The reason why Zacharias doubted was, that, stopping at the ordinary course of nature, he ascribed less than he ought to have done to the power of God. They take a narrow and disparaging view of the works of God, who believe that he will do no more than nature holds out to be probable, as if his hand were limited to our senses or confined to earthly means. But it belongs to faith to believe that more can be done than carnal reason admits. Zacharias had no hesitation with regard to its being the voice of God, but as he looked too exclusively at the world, an indirect doubt arose in his mind if what he had heard would really happen. In that respect he did no slight injury to God, for he went so far as to reason with himself, whether God, who had undoubtedly spoken to him, should be regarded as worthy of credit. At the same time, we ought to know that Zacharias was not so unbelieving as to turn aside wholly from the faith; for there is a general faith which embraces the promise of eternal salvation and the testimony of a free adoption. On the other hand, when God has once received us into favor, he gives us many special promises, -- that he will feed us, will deliver us from dangers, will vindicate our reputation, will protect our life; -- and so there is a special faith which answers particularly to each of these promises. Thus, it will sometimes happen, that one who trusts in God for the pardon of his sins, and for salvation, will waver on some point, -- will be too much alarmed by the dread of death, too solicitous about daily food, or too anxious about his plans. Such was the unbelief of Zacharias; for while he held the root and foundation of faith, he hesitated only on one point, whether God would give to him a son. Let us know, therefore, that those who are perplexed or disturbed by weakness on some particular occasion do not entirely depart or fall off from the faith, and that, though the branches of faith are agitated by various tempests, it does not give way at the root. Besides, nothing was farther from the intention of Zacharias than to call in question the truth of a divine promise; but while he was convinced generally that God is faithful, he was cunningly drawn by the craft and wiles of Satan to draw a wicked distinction. It is all the more necessary for us to keep diligent watch: for which of us shall be secure against the snares of the devil, when we learn that a man so eminently holy, who had all his life maintained strict watchfulness over himself, was overtaken by them?

Whereby shall I know this? - The thing was improbable, and he desired "evidence" that it would take place. The testimony of an "angel," and in such a place, should have been proof enough; but people are slow to believe the testimony of heavenly messengers. As a consequence of not believing, he was struck mute.

Whereby shall I know this? - All things are possible to God: no natural impediment can have any power when God has declared he will accomplish his purpose. He has a right to be believed on his own word alone; and it is impious, when we are convinced that it is his word, to demand a sign or pledge for its fulfillment.

And Zacharias said unto the angel, whereby shall I know this?.... Notwithstanding such an appearance of an angel to him, which in those times was not so usual, and this in the holy place; and the things themselves which were told him, and these as the return of prayer; yet he distrusted, and wanted a sign, whereby he might know the truth of them, as the Jews were generally desirous of, and as the father of them was; who expressed himself in much such language, on a certain occasion, as this his son did; see Genesis 15:8.
For I am an old man; at least sixty years of age; for with the Jews, sixty years were reckoned, "for old age" (w); and a man of these years, was accounted an old man: and the Jewish Rabbins observe (x), that the word for old age in Job 30:2 is by "gematry, sixty"; that is, the letters of the word, numerically make so much. The Mahometan writers, as before observed on Luke 1:7 make him to be ninety nine years of age: he was not discharged from service; the Levites were at fifty, but not the priests; blemishes, as the Jewish writers say (y), made them unfit for service, but years did not: and even the law concerning the Levites, they say (z), only respected the time they carried the sanctuary from place to place, and not future generations; and that they are disqualified neither by blemishes, nor by years, only by voice, for singing of the song; but then they might be among the porters; so that they were not on that account laid aside from all service:
and my wife well stricken in years. The Mahometan writers, as before, say, she was "eighty nine"; a like objection Abraham made, though he afterwards got over it, and was strong in faith, giving glory to God, believing in his power and faithfulness; see Genesis 17:17.
(w) Misn. Abot, c. 5. sect. 21. & Maimon. in ib. (x) R. Song. Urbin. Ohel Moed, fol. 24. 2. (y) T. Bab. Cholin, fol. 24. 1. (z) Maimon. Hilch. Cele Hamikdash, c. 3. sect. 8.

Whereby, &c.--Mary believed what was far harder without a sign. Abraham, though older, and doubtless Sarah, too, when the same promise was made to him, "staggered not at the promise of God through unbelief, but was strong in faith, giving glory to God." This was that in which Zacharias failed.

Whereby shall I know this? He wanted a sign.

Zacharias said, Whereby shall I know this? - In how different a spirit did he blessed virgin say, How shall this be? Zacharias disbelieved the fact: Mary had no doubt of the thing; but only inquired concerning the manner of it.