Hebrews 4:2

The gospel] RV 'Good tidings,' i.e. a promise of the rest of God. Not being mixed with faith] RV adopts AVmg. 'because they were not united by faith with them that heard,' which is the rendering of a well-attested various reading. This makes a distinction between 'those who heard' (i.e. believed and obeyed), who must be Joshua and Caleb, and those who believed not. But in Hebrews 3:16 it is assumed that all believed not. The rendering of AV gives good sense. Faith is the means whereby the word that is heard is vitally appropriated and realised in action.

3. The promise of rest applies to us who are Christians, seeing that those to whom the promise was made failed to attain to it. And their failure was not due to the fact that the rest was not prepared, because it existed since the day that God finished His work of creation. This is proved by the words 'and God rested' in one place, and the words 'my rest' in another. God's rest is therefore a fact, and it is clearly His purpose that some shall enter into it.