Albert Barnes Commentary Psalms 95:9

"When your fathers tempted me, Proved me, and saw my work." — Psalms 95:9 (ASV)

When your fathers - Your ancestors. See this verse explained in the notes on Hebrews 3:9.

Tempted me - Tried me; tried my patience, to see how much I would bear. This does not mean, as it commonly means for us today, to place inducements before one to lead him into sin, but to try one—to put his patience to the test. This they did, in the case referred to, by their obduracy and evil conduct.

Proved me - See the notes at Hebrews 3:9. And saw my work. Though they constantly saw my work, saw my gracious interpositions, and saw what I was doing for their own good.