Albert Barnes Commentary Hebrews 4:11

"Let us therefore give diligence to enter into that rest, that no man fall after the same example of disobedience." — Hebrews 4:11 (ASV)

Let us labour therefore. Let us earnestly strive. Since there is a rest whose attainment is worth all our efforts; since so many have failed to reach it by their unbelief; and since there is so much danger that we may fail to reach it also, let us give all diligence that we may enter into it. Heaven is never obtained except by diligence, and no one enters there who does not earnestly desire it, and who does not make a sincere effort to reach it.

Of unbelief. In the margin: disobedience. The word unbelief best expresses the sense, as the apostle was showing that this was the principal thing that prevented people from entering into heaven. See the notes on Hebrews 3:12.