John Gill Commentary Isaiah 26:7

"The way of the just is uprightness: thou that art upright dost direct the path of the just." — Isaiah 26:7 (ASV)

The way of the just [is] uprightness
Or, "the way which is appointed for him, and which he is directed to walk in, is a way of righteousness and holiness, and in which he does walk; he walks uprightly, according to the rules of the word, becoming the Gospel of Christ, and worthy of his calling: or, it is "evennesses"; a most plain and even way, in which men, though fools, shall not err, (Isaiah 35:8) or, "the way" of the Lord "to the just is uprightnesses", or "evennesses"; most upright, or most even; there is no inequality in it, though sometimes so charged, (Ezekiel 18:25Ezekiel 18:29) it is entirely agreeable to justice, equity, and truth; regular and even, and suited to all his perfections of wisdom, goodness ^F20 .

thou most upright ;
these words are addressed to God, and contain an appellation and description of him, who is upright, just, and true, and loves upright and righteous persons; so Kimchi and Ben Melech take the word to be in the vocative case, and as an address to God; though some render them, "he is upright" ^F21 ; that is, the just man is upright, whose way is uprightness; but the former sense best agrees with what follows: dost weigh the path of the just ;
observe, consider, and approve of it, as being according to rule, and agreeable to his mind and will, (Psalms 1:6) or, "thou dost level" or "make even the path of the just" ^F23 ; remove all impediments and obstructions out of it, direct his goings, order his steps, and cause him to walk in a straight way, wherein he shall not stumble, (Jeremiah 31:9) and so this is a reason given why the way of the just is even, because it is made so by the Lord himself.

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FOOTNOTES:

• F19: (Myrvym qydul xrwa) "via justo rectitudines", Vatablus.
• F20: For this note, I am indebted to my learned, pious, and ingenious friend, the Rev. Mr. Hervey; see Theron and Aspasio, vol 2. Dialog. 13. p. 225. Ed 3.
• F21: (rvy) "rectus est", De Dieu.
• F23: (olpt) "aequabis", Vatablus. So Ben Melech explains it by (rvwy) , making a thing plain and even.