And he measured the wall thereof, an hundred and forty and four cubits, according to the measure of a man, that is, of the angel.

And he measured its wall, a hundred and forty-four cubits, a man's measure, that is, the angel's.

and he measured its wall, an hundred forty-four cubits, the measure of a man, that is, of the messenger;

And he measured the wall of it - a wall of a hundred and forty-four cubits, according to human measure, which was also that of the angel.

And he took the measure of its wall, one hundred and forty-four cubits, after the measure of a man, that is, of an angel.

Then he measured the wall; it was two hundred and eighty-eight feet, as people measure, that is as the angel measured.

And he measured the wall thereof - In respect to its "height." Of course, its length corresponded with the extent of the city.
An hundred and forty and four cubits - This would be, reckoning the cubit at eighteen inches, two hundred and sixteen feet. This is less than the height of the walls of Babylon, which Herodotus says were three hundred and fifty feet high. See the introduction to chapter 13 of Isaiah. As the walls of a city are designed to protect it from external foes, the height mentioned here gives all proper ideas of security; and we are to conceive of the city itself as towering immensely above the walls. Its glory, therefore, would not be obscured by the wall that was thrown around it for defense.
According to the measure of a man - The measure usually employed by men. This seems to be added in order to prevent any mistake as to the size of the city. It is an "angel" who makes the measurement, and without this explanation it might perhaps be supposed that he used some measure not in common use among people, so that, after all, it would be impossible to form any definite idea of the size of the city.
That is, of the angel - That is, "which is the measure employed by the angel." It was, indeed, an angel who measured the city, but the measure which he employed was that in common use among people.

The wall - a hundred and forty and four cubits - This is twelve, the number of the apostles, multiplied by itself: for twelve times twelve make one hundred and forty-four.
The measure of a man, that is, of the angel - The cubit, so called from cubitus, the elbow, is the measure from the tip of the elbow to the tip of the middle finger, and is generally reckoned at one foot and a half, or eighteen inches; though it appears, from some measurements at the pyramids of Egypt, that the cubit was, at least in some cases, twenty-one inches.
By the cubit of a man we may here understand the ordinary cubit, and that this was the angel's cubit who appeared in the form of a man. Or suppose we understand the height of the man as being here intended, and that this was the length of the measuring rod. Now allowing this height and rod to be six feet, and that this was intended to have some kind of symbolical reference to the twelve tribes, mentioned Revelation 21:12, represented by the twelve gates; and to the twelve apostles, represented by the twelve thresholds or foundations; then twenty-four, the number of the tribes and apostles, multiplied by six, make precisely the number one hundred and forty-four.

And he measured the wall thereof, an hundred [and] forty [and] four cubits, [according to] the measure of a man, that is, of the (c) angel.
(c) He adds this, because the angel had the shape of a man.

And he measured the wall thereof, an hundred and forty and four cubits,.... The root of which is twelve, for twelve times twelve is a hundred and forty four; which number is mystical and apostolical, and suited to the perfect state of this church: hence twelve gates, and twelve angels at them, and the names of the twelve tribes on them, and twelve foundations of the wall, and twelve thousand furlongs, the measure of the city.
According to the measure of a man, that is, of the angel; who talked with John, and measured the city, gates, and wall, and who appeared in the form of a man; and his reed might be, as some have supposed, the length of a man, six cubits, or six feet, as in Ezekiel 40:5 and may denote that this business requires the utmost wisdom and understanding of a man, and even of an angel, to look into, and find out; see Revelation 13:18 and also may signify the angelic state of the saints at this time, when the children of the resurrection will be like the angels of God, for immortality and glory.

hundred . . . forty . . . four cubits--twelve times twelve: the Church-number squared. The wall is far beneath the height of the city.
measure of a man, that is, of the angel--The ordinary measure used by men is the measure here used by the angel, distinct from "the measure of the sanctuary." Men shall then be equal to the angels.