do not harden your hearts as you did at Meribah, in the day at Massah in the wilderness, where your fathers tested and tried Me, though they had seen My work. For forty years I was angry with that generation, and I said, "They are a people whose hearts go astray, and they have not known My ways." So I swore on oath in My anger, "They shall never enter My rest."
For you have not yet come to the resting place and the inheritance that the LORD your God is giving you.
Significance
Psalm 95:11 records God's oath "They shall never enter My rest (מְנוּחָתִי, menuchati)" — the divine rest denied to the wilderness generation. Deuteronomy 12:9 identifies this rest: "you have not yet come to the resting place (מְנוּחָה, menuchah) and the inheritance that the LORD your God is giving you." The shared term menuchah connects the psalm's warning to the Deuteronomic promise: the rest that Moses anticipated as Israel's inheritance in the land is the very rest the rebellious generation forfeited. The psalm's imperative "Today, if you hear His voice, do not harden your hearts" makes the wilderness failure a perpetual liturgical warning — each generation faces the same choice between faith and forfeiture of God's promised rest.
Found via
Keil and Delitzsch, Commentary on the Old Testament (1866)