Brother, the oath in Numbers cannot be the oath in Hebrews 3 and 4 because the leader after Moses who led the people to the Promised Land did not give them this "rest".
Now if Joshua had succeeded in giving them this rest, God would not have spoken about another day of rest still to come. (Hebrews 4:8 NLT)
God's rest on the seventh day of creation is the only meaning that the message of Hebrews 3 and 4 gives to the word "rest", any other meaning is speculation that contradicts what God said the word "rest" means.
The message of Hebrews 3 and 4 mentions the Sabbath independently of the fourth commandment. Even if you mistakenly believe that the commandments are no longer binding, the Sabbath remains because of this message in the new covenant with Jesus as our High Priest.
God’s promise of entering his rest still stands, so we ought to tremble with fear that some of you might fail to experience it. For this good news—that God has prepared this rest—has been announced to us just as it was to them. But it did them no good because they didn’t share the faith of those who listened to God. For only we who believe can enter his rest. As for the others, God said, “In my anger I took an oath: ‘They will never enter my place of rest,’” even though this rest has been ready since he made the world. We know it is ready because of the place in the Scriptures where it mentions the seventh day: “On the seventh day God rested from all his work.” But in the other passage God said, “They will never enter my place of rest.” (Hebrews 4:1-5 NLT)
United in our hope for the soon return of Jesus, Jorge