We are required to enter into God rest now, or we will not enter into the coming rest of the creation then.
Heb 3:6 But Christ as a son over his own house; whose house are we, if we hold fast the confidence and the rejoicing of the hope firm unto the end.
Heb 3:7 Wherefore (as the Holy Ghost saith, To day if ye will hear his voice,
Heb 3:8 Harden not your hearts, as in the provocation, in the day of temptation in the wilderness:
Heb 3:9 When your fathers tempted me, proved me, and saw my works forty years.
Heb 3:10 Wherefore I was grieved with that generation, and said, They do alway err in their heart; and they have not known my ways.
Heb 3:11 So I sware in my wrath, They shall not enter into my rest.)
Heb 3:12 Take heed, brethren, lest there be in any of you an evil heart of unbelief, in departing from the living God.
Heb 3:13 But exhort one another daily, while it is called To day; lest any of you be hardened through the deceitfulness of sin.
Heb 3:14 For we are made partakers of Christ, if we hold the beginning of our confidence stedfast unto the end;
Heb 3:15 While it is said, To day if ye will hear his voice, harden not your hearts, as in the provocation.
Heb 3:16 For some, when they had heard, did provoke: howbeit not all that came out of Egypt by Moses.
Heb 3:17 But with whom was he grieved forty years? was it not with them that had sinned, whose carcases fell in the wilderness?
Heb 3:18 And to whom sware he that they should not enter into his rest, but to them that believed not?
Heb 3:19 So we see that they could not enter in because of unbelief.