Hebräer 3:9

When--rather, "Where," namely, in the wilderness. your fathers--The authority of the ancients is not conclusive [BENGEL]. tempted me, proved me--The oldest manuscripts read, "tempted (Me) in the way of testing," that is, putting (Me) to the proof whether I was able and willing to relieve them, not believing that I am so. saw my works forty years--They saw, without being led thereby to repentance, My works of power partly in affording miraculous help, partly in executing vengeance, forty years. The "forty years" joined in the Hebrew and Septuagint, and below, Heb 3:17, with "I was grieved," is here joined with "they saw." Both are true; for, during the same forty years that they were tempting God by unbelief, notwithstanding their seeing God's miraculous works, God was being grieved. The lesson intended to be hinted to the Hebrew Christians is, their "to-day" is to last only between the first preaching of the Gospel and Jerusalem's impending overthrow, namely, FORTY YEARS; exactly the number of years of Israel's sojourn in the wilderness, until the full measure of their guilt having been filled up all the rebels were overthrown.

In this chapter the apostle applies what he had said in the chapter foregoing concerning the priesthood of Christ, I. In a serious pathetic exhortation that this great high priest, who was discovered to them, might be seriously considered by them (Heb 3:1-6). II. He then adds many weighty counsels and cautions (Heb 3:7 to the end).

3:9-10 Despite seeing the miracles God had performed on their behalf, the people of Israel tested God’s patience by refusing to trust him in the wilderness (Num 14:11, 22). The essence of their rebellion was that their hearts always turned away from God—they did not desire to obey him. The result was that God was angry with them.