Expositor's Bible Commentary Commentary Hebrews 4:5

"and in this [place] again, They shall not enter into my rest." — Hebrews 4:5 (ASV)

The writer again adds Ps 95:11, which is central to his argument at this point. As here, he often uses “again” where a further quotation is added to a preceding one (e.g., 1:5; 2:13; 10:30). In this case, however, it does more than reinforce his idea; it introduces a second point in the argument. The first passage said that God rested (and by implication that the rest was open to those who would enter it); the second passage said that the Israelites did not enter that rest because God’s judgment fell on them. So the way is prepared for later steps in the argument.