Albert Barnes 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. The Hebrew is literally, ‘The way to the just is uprightness;’ the word ‘way’ probably refers to God’s way, or his dealings with the righteous.

The sentiment is that his dealings with them are just; that though they are afflicted and oppressed, his ways are still right, and they will eventually perceive it.

This is language supposed to be used by the captive Jews after they had seen the proud city of Babylon taken, and after God came forth to restore them to their own land.

The word ‘uprightness’ in the original is in the plural number but is often used in the sense of straightness (Proverbs 23:31; Song of Solomon 7:10), of sincerity or uprightness (Song of Solomon 1:4), or of righteousness as a judge (Psalms 9:9; Psalms 58:2; Psalms 99:4).

Thou most upright. This is evidently an address to God, as being most just, and as having now demonstrated his uprightness in the deliverance of his people. The same epithet is applied to him in Deuteronomy 32:4; Psalms 25:8;Psalms 92:16.

Dost weigh the path of the just. The word used here (פלס pâlac) may mean to weigh as in a balance (Psalms 58:3), but it may also mean, and usually does, to make straight or smooth, to beat a path, or to make level (Psalms 78:50; Proverbs 4:26; Proverbs 5:21).

Here it probably means that God made the way smooth or exactly level. He removed all obstacles and conducted his people in a plain and leveled way (see the notes at Isaiah 40:3-4).