Hebrews 4:1

Let us therefore fear. The same warning is sounded in 1 Cor. 10:1-12. Seemingly oblivious to their own grave danger, Christians may be prone to look critically at the obtuseness of the generation of Hebrews that failed to enter Canaan and of later generations that failed to enter into the spiritual “rest” God had planned for Israel as a nation (see on Heb. 3:11). Beginning with Heb. 4:1 the writer proceeds to apply the lesson from the history of Israel in the wilderness to the experience of the Christian church in apostolic times. In principle, Christians today are in the same danger and are in need of the same admonition to faithfulness.

A promise being left. The promise of entering into God’s “rest” had not been withdrawn as a result of Israel’s repeated mistakes. The promise remains valid and is repeated to each successive generation.

His rest. See on ch. 3:11.

You. Specifically, the Christian Jews to whom the epistle was addressed. To be sure, the same is true of all Christians.

Come short. That is, fail as ancient Israel had failed to enter into God’s promised “rest.”