Hebrews 4:4-8

4For he has said somewhere of the seventh [day] thus, And 1God rested on the seventh day from all his works:

5and in this again, If they shall enter into my rest.

6Seeing therefore it remains that some enter into it, and those who first received the glad tidings did not enter in on account of not hearkening to the word,

7again he determines a certain day, saying, in David, 'To-day,' after so long a time; (according as it has been said before), To-day, if ye will hear his voice, harden not your hearts.

8For if Jesus had brought them into rest, he would not have spoken afterwards about another day.