Albert Barnes Commentary Psalms 95:8

"Harden not your heart, as at Meribah, As in the day of Massah in the wilderness;" — Psalms 95:8 (ASV)

Harden not your heart - See this verse explained in the notes at Hebrews 3:8.

As in the provocation ... - Margin, “contention.” The original is “Meribah.” See Exodus 17:7, where the original words Meribah, rendered here “provocation,” and “Massah,” rendered here “temptation,” are retained in the translation.