John Gill Commentary Psalms 119:90

"Thy faithfulness is unto all generations: Thou hast established the earth, and it abideth." — Psalms 119:90 (ASV)

Your faithfulness [is] unto all generations
Or "to generation and generation" ^F25; to his people in every age, fulfilling his word, supplying their wants, giving them new mercies every morning and every day; never leaving and forsaking them, according to his promise: his faithfulness never fails, it endures for ever, and is exceeding great and large indeed; see (Lamentations 3:23) (Psalms 89:33) (100:5);

you have established the earth, and it abides:
laid the foundation of it so firm and sure, that it cannot be removed: and though one generation has passed after another, the earth abides where it was, and will do for ever; and as firm and stable, and never failing, is the faithfulness of God, which this is designed to illustrate. So some supply it, "as you have established the earth" ^F26; see (Psalms 24:2) (104:5) (Ecclesiastes 1:4) .

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FOOTNOTES:

• F25: (rdw rdl) "in generationem et generationem", Gejerus; "in aetatem et aetatem", Cocceius.
• F26: "Quemadmodum vel sicut fundasti", Gejerus.