Then while it is [still] called Today, if you would hear His voice and when you hear it, do not harden your hearts as in the rebellion [in the desert, when the people provoked and irritated and embittered God against them].
This is what the Scripture says: “Today ·listen to what he says [L if you hear his voice…]. Do not ·be stubborn [L harden your hearts] as in the past ·when you turned against God [L as in the rebellion; Ps. 95:7–8; C referring to Ex. 17:1–7].”
You should therefore be most careful, my brothers, that there should not be in any of you that wickedness of heart which refuses to trust, and deserts the cause of the living God. Help each other to stand firm in the faith every day, while it is still called “today”, and beware that none of you becomes deaf and blind to God through the delusive glamour of sin. For we continue to share in all that Christ has for us so long as we steadily maintain until the end the trust with which we began. These words are still being said for our ears to hear: ‘Today, if you will hear his voice, do not harden your hearts as in the rebellion’.
But now is the time. Never forget the warning, “Today if you hear God’s voice speaking to you, do not harden your hearts against him, as the people of Israel did when they rebelled against him in the desert.”
For who were the people who turned a deaf ear? Weren’t they the very ones Moses led out of Egypt? And who was God provoked with for forty years? Wasn’t it those who turned a deaf ear and ended up corpses in the wilderness? And when he swore that they’d never get where they were going, wasn’t he talking to the ones who turned a deaf ear? They never got there because they never listened, never believed.
As it is said, "HAYOM IM BEKOLO TISHMAU AL TAKSHU LEVAVCHEM ("Today, if you hear his voice, do not harden your heart" TEHILLIM 95:7) as in the Meribah Mered (Rebellion) [the Ma’al shmad Defection, the Azivah Desertion, see 2Th 2:3].