And it was revealed unto him - In what way this was done we are not informed. Sometimes a revelation was made by a dream, at others by a voice, and at others by silent suggestion. All we know of this is that it was by the Holy Spirit.
Not see death - Should not die. To "see" death and to "taste" of death, was a common way among the Hebrews of expressing death itself. Compare Psalm 89:48.
The Lord's Christ - Rather "the Lord's Anointed." The word "Christ" means "anointed," and it would have been better to use that word here. To an aged man who had been long waiting for the Messiah, how grateful must have been this revelation - this solemn assurance that the Messiah was near! But this revelation is now given to every man, that he need not taste of death until, by the eye of faith, he may see the Christ of God. He is offered freely. He has come. He waits to manifest himself to the world, and he is not willing that any should die forever. To us also it will be as great a privilege in our dying hours to have seen Christ by faith as it was to Simeon. It will be the only thing that can support us then - the only thing that will enable us to depart in peace.

It was revealed unto him - He was divinely informed, κεχρηματισμενον - he had an express communication from God concerning the subject. The secret of the Lord is with them that fear him. The soul of a righteous and devout man is a proper habitation for the Holy Spirit.
He should not see death - They that seek shall find: it is impossible that a man who is earnestly seeking the salvation of God, should be permitted to die without finding it.
The Lord's Christ - Rather, the Lord's anointed. That prophet, priest, and king, who was typified by so many anointed persons under the old covenant; and who was appointed to come in the fullness of time, to accomplish all that was written in the law, in the prophets, and in the Psalm, concerning him. See the note on Luke 2:11.

And it was revealed unto him by the Holy Ghost,.... Not in a dream, as the wise men were warned, nor by an angel, as Joseph, nor by a voice from heaven, which the Jews call "Bath Kol", but by the inspiration of the Holy Ghost, enlightening his understanding, and impressing on his mind:
that he should not see death; an Hebraism, see it in Psalm 89:48 the same with the phrase, "to taste death", elsewhere used; and the sense is, as the Ethiopic version renders it, "that he should not die"; or as the Persic version, "that his death should not be"; as yet: he should live some time longer; nor should that messenger be sent to remove him, though a man in years, out of time into eternity,
before he had seen the Lord's Christ: with his bodily eyes: for he had seen him with an eye of faith already, and in the promise, as Abraham had; and in the types and sacrifices of the law, as the rest of believers under the Old Testament. The Messiah is called the Lord's Christ, referring to Psalm 2:2 because he was anointed by Jehovah, the Father, and with Jehovah, the Spirit; with the Holy Ghost, the oil of gladness, to be prophet, priest, and king, in the Lord's house. So the Messiah is by the Targumist called, the Messiah of Jehovah, or Jehovah's Messiah; that is as here, the Lord's Christ: thus in the Targum on Isaiah 4:2 it is said,
"in that time, , "Jehovah's Messiah", shall be for joy and for glory.
And on Isaiah 28:5 the paraphrase is,
"at that time, , "the Messiah of the Lord" of hosts shall be for a crown of joy, and for a diadem of praise to the rest of his people.
Compare these paraphrases with what is said of Christ, in Luke 2:32. "The glory of thy people Israel"; Simeon's language exactly agrees with the Targumist. The Persic version adds, "and with this hope he passed his time, or age, and became very old and decrepit."

revealed by the Holy Ghost--implying, beyond all doubt, the personality of the Spirit.
should see not death till he had seen--"sweet antithesis!" [BENGEL]. How would the one sight gild the gloom of the other! He was, probably, by this time, advanced in years.