Verse 31: (Ps. 83:9, 10) So let all thine enemies perish, O LORD: but let them that love him be (2 Sam. 23:4) as the sun (Ps. 19:5) when he goeth forth in his might. And the land had rest forty years.
So, that is, so suddenly, so surely, so effectually and irrecoverably.
[Just as the sun in its rising shines, כְּצֵ֥את הַשֶּׁ֖מֶשׁ בִּגְבֻרָת֑וֹ] As to go forth of the sun (as the rising of the sun [Syriac, Arabic]) in its strength (Montanus). Let them be just like the sun when it rises (or, goes forth [Munster], advances [Junius and Tremellius], rises and goes forth [Dutch]) in its strength (Munster, Pagnine, Tigurinus). They shall be as the going forth of the sun; that is, Let them advance, or obtain strength, just like the sun when it rises constantly becomes brighter: that is, let them become ever greater and most illustrious; that is, similar to the rising Sun (Grotius). Let them be strengthened as the sun increases from its rising to its strength (Martyr). Let them be like unto the sun rising with its strength (Castalio). Just as the sun to go forth in its strength; that is, when in the middle of summer it holds the first degree of Cancer (Malvenda). [Why might it not be translated, as the sun when it goes forth unto, or toward, its strength?]
When he goeth forth in his might; when he first riseth, and so goeth on in his course, which he doth with great might, even as a strong man that runneth a race, Psalm 19:5, and so as no creature can stop or hinder him; even so irresistible let the people be.
[Forty years] Under these are contained the twenty years in which Jabin oppressed the Hebrews, Judges 4:3 (Lapide). See above on Judges 3:11 (Bonfrerius). Forty years, namely, from that eighty years, Judges 3:30 (Junius).
Forty years; how to be computed, see before on Judges 3:11.
 Hebrew: כֵּ֠ן יֹאבְד֤וּ כָל־אוֹיְבֶ֙יךָ֙ יְהוָ֔ה וְאֹ֣הֲבָ֔יו כְּצֵ֥את הַשֶּׁ֖מֶשׁ בִּגְבֻרָת֑וֹ וַתִּשְׁקֹ֥ט הָאָ֖רֶץ אַרְבָּעִ֥ים שָׁנָֽה׃
 A woodenly literalistic rendering of the Hebrew.