Albert Barnes Commentary Psalms 66:10

"For thou, O God, hast proved us: Thou hast tried us, as silver is tried." — Psalms 66:10 (ASV)

For thou, O God, hast proved us - That is, You have tried us; You have tested the reality of our attachment to you, as silver is tried by the application of fire. God had proved or tried them by bringing calamity upon them to test the reality of their allegiance to him. The nature of the proof or trial is referred to in the following verses.

Thou hast tried us, as silver is tried - That is, by being subjected to appropriate tests to ascertain its real nature, and to remove from it imperfections. Compare the notes at 1 Peter 1:7; notes at Isaiah 1:25; notes at Isaiah 48:10; see also Zechariah 13:9; Malachi 3:3.