His mouth was opened ... - That is, he was enabled to speak. For nine months he had been mute, and it is probable that they supposed that he had been afflicted with a paralytic affection, and that he would not recover. Hence, their amazement when he spoke. For one act of disbelief all this calamity had come upon him, and it had not come without effect. With true gratitude he offered praise to God for the birth of a son, and for his restoration to the blessings of speech.

The latter clause of the preceding verse should be joined with the beginning of this, as follows: And they marveled all, for his mouth was opened, etc. Every person must see the propriety of putting this clause, And they marveled all, to the beginning of the 64th verse, instead of leaving it at the end of the 63rd, as in the common version. The people did not wonder because Zacharias said, He shall be called John; but because he himself was that instant restored to the use of his speech.

And he spake, and praised God - In his nine months' silence, he had learned the proper use of his tongue; and God, whose power was discredited by it, is now magnified. Happy they who, in religious matters, only break silence in order to speak of the loving-kindness of the Lord!

And his mouth was opened immediately,.... As soon as ever the child was named, and so all things accomplished which the angel had foretold,

and his tongue loosed; the impediments of speech were removed, and the use of his tongue and lips was restored unto him:

and he spake and praised God; for the safe delivery of his wife; for the birth of his son, the forerunner of Christ; for the conception of the Messiah; for God's gracious regards to his church and people, in these instances; and for the restoration of speech and hearing to himself, of which he had been some time deprived for his unbelief.

Immediately (παραχρῆμα)

Occurring nineteen times in the New Testament, and seventeen of these in Luke. Thirteen of the seventeen are in connection with miracles of healing, or the infliction of disease or death. Used in a similar way by medical writers.

And his mouth was opened immediately, and his tongue loosed, and he spake, and praised God.

64. mouth opened immediately-on thus palpably showing his full faith in the vision, for disbelieving which he had been struck dumb (Lu 1:13, 20).

1:57-66 In these verses we have an account of the birth of John the Baptist, and the great joy among all the relations of the family. He shall be called Johanan, or Gracious, because he shall bring in the gospel of Christ, wherein God's grace shines most bright. Zacharias recovered his speech. Unbelief closed his mouth, and believing opened it again: he believers, therefore he speaks. When God opens our lips, our mouths must show forth his praise; and better be without speech, than not use it in praising God. It is said, The hand of the Lord was working with John. God has ways of working on children in their infancy, which we cannot account for. We should observe the dealings of God, and wait the event.