7 So, as the Holy Spirit says:
“Today, if you hear his voice,
8 do not harden your hearts
as you did in the rebellion,
during the time of testing in the wilderness,
9 where your ancestors tested and tried me,
though for forty years they saw what I did.
10 That is why I was angry with that generation;
I said, ‘Their hearts are always going astray,
and they have not known my ways.’
11 So I declared on oath in my anger,
‘They shall never enter my rest.’ ”
12 See to it, brothers and sisters, that none of you has a sinful, unbelieving heart that turns away from the living God. 13 But encourage one another daily, as long as it is called “Today,” so that none of you may be hardened by sin’s deceitfulness. 14 We have come to share in Christ, if indeed we hold our original conviction firmly to the very end. 15 As has just been said:
“Today, if you hear his voice,
do not harden your hearts
as you did in the rebellion.”
16 Who were they who heard and rebelled? Were they not all those Moses led out of Egypt? 17 And with whom was he angry for forty years? Was it not with those who sinned, whose bodies perished in the wilderness? 18 And to whom did God swear that they would never enter his rest if not to those who disobeyed?
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Highlights from chapter 3
“Today, do not harden your hearts as you did in the rebellion,Their hearts are always going astray,
and they have not known my ways. See to it, brothers and sisters, that none of you has a sinful, unbelieving heart that turns away from the living God. so that none of you may be hardened by sin’s deceitfulness"
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Chapter 4
4 Therefore, since the promise of entering his rest still stands, let us be careful that none of you be found to have fallen short of it. 2 For we also have had the good news proclaimed to us, just as they did; but the message they heard was of no value to them, because they did not share the faith of those who obeyed.
Now we who have believed enter that rest, just as God has said,
“So I declared on oath in my anger,
‘They shall never enter my rest.’”
And yet his works have been finished since the creation of the world. 4 For somewhere he has spoken about the seventh day in these words: “On the seventh day God rested from all his works.” 5 And again in the passage above he says, “They shall never enter my rest.”
6 Therefore since it still remains for some to enter that rest, and since those who formerly had the good news proclaimed to them did not go in because of their disobedience,7 God again set a certain day, calling it “Today.” This he did when a long time later he spoke through David, as in the passage already quoted:
“Today, if you hear his voice,
do not harden your hearts.”
8 For if Joshua had given them rest, God would not have spoken later about another day. 9 There remains, then, a Sabbath-rest for the people of God; 10 for anyone who enters God’s rest also rests from their works,[e](J) just as God did from his.(K) 11 Let us, therefore, make every effort to enter that rest, so that no one will perish by following their example of disobedience.(L)
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Highlights of chapter 4
"since the promise of entering his rest still stands for we also have had the good news proclaimed to us, just as they did; but the message they heard was of no value to them, because they did not share the faith of those who obeyed.
Now we who have believed enter that rest, just as God has said. There remains, then, a Sabbath-rest for the people of God; for anyone who enters God’s rest also rests from their works, just as God did from his. Let us, therefore, make every effort to enter that rest, so that no one will perish by following their example of disobedience"
Now, 3 and 4 together
“Today, do not harden your hearts as you did in the rebellion,Their hearts are always going astray,
and they have not known my ways. See to it, brothers and sisters, that none of you has a sinful, unbelieving heart that turns away from the living God. so that none of you may be hardened by sin’s deceitfulness since the promise of entering his rest still stands for we also have had the good news proclaimed to us, just as they did; but the message they heard was of no value to them, because they did not share the faith of those who obeyed.
Now we who have believed enter that rest, just as God has said. There remains, then, a Sabbath-rest for the people of God; for anyone who enters God’s rest also rests from their works, just as God did from his. Let us, therefore, make every effort to enter that rest, so that no one will perish by following their example of disobedience"
In summary.. If you are a believer, you should not be disobedient to the ways of God. If you are a believer, you should be holding to the commands of God any day that you can call today. If you are a believer, you obey the Sabbath just as God did, when He ceased from his work.