Instead of the thorn shall come up the fir tree, and instead of the brier shall come up the myrtle tree: and it shall be to the LORD for a name, for an everlasting sign that shall not be cut off. Instead of the thorn "Instead of the thorny bushes" - These likewise (see note on Isaiah 55:12, and on Isaiah 54:11 (note)) are general poetical images, expressing a great and happy change for the better. The wilderness turned into a paradise, Lebanon into Carmel: the desert of the Gentiles watered with the heavenly snow and rain, which fail not to have their due effect, and becoming fruitful in piety and righteousness: or, as the Chaldee gives the moral sense of the emblem, "instead of the wicked shall arise the just; and instead of sinners, such as fear to sin." Compare Isaiah 35:1, Isaiah 35:2; Isaiah 41:19.
And instead of - The conjunction ו vau is added, ותחת vetachath, in forty-five MSS. of Kennicott's several of De Rossi's, and five editions; and it is acknowledged by all the ancient Versions. The Masoretes therefore might have safely received it into the text, and not have referred us for it to the margin. But this is no uncommon case with them. Even in our own Version the best reading is very often found in the margin.
Commentary on the Bible, by Adam Clarke [1831].