This is another circumstance of the example of the Jews applied to them: That since now Christ is speaking to you, as he did to your forefathers then; the same voice concerning you both, so as, not to-morrow, or when you will, but To-day, if you will believe what God speaketh to you by him, and hath recorded in his word concerning his being the Messiah, and render not yourselves deaf to God's voice, or obdurate through unbelief, as your forefathers did, when their unbelief and hardness of heart imbittered God's Spirit against them, because acting in it against their solemn vows and engagements to him, so as to apostatize from him.
Related Commentaries of Hebrews 3:15
Hebrews 3:15
15 While it is said, To day if ye will hear his voice, harden not your hearts, as in the provocation.