Unknown Author
Hebrews 3:19BSB·author unknown

So we see that it was because of their unbelief that they were unable to enter.

Matthew Henry Presbyterian @wholebiblehenry

Here the apostle proceeds in pressing upon them serious counsels and cautions to the close of the chapter; and he recites a passage out of Psa 95:7, etc., where observe, I. What he counsels them to do - to give a speedy and present attention to the call of Christ.

Commenting on Hebrews 3:7-19

Albert Barnes Presbyterian @notesbybarnes

Verse 19. So we see, etc. We see, from the direct testimony of the Old Testament, that unbelief was the reason why they were excluded from the promised land. Let us learn, in view of the reasoning and exhortations here-- (1.) The evil of unbelief.

Jamieson-Fausset-Brown Reformed @jfbcommentary

they could not enter--though desiring it. Next: Hebrews Chapter 4