Hebrews 4:3

For we which have believed do enter into rest Rather, "For we who believed" (i.e. we who have accepted the word of hearing) "are entering into that rest."

if they shall enter This ought to have been rendered as in Hebrews 3:11, "they shall not enter" The argument of the verse is (1) God promised a rest to the Israelites. (2) Many of them failed to enter in. (3) Yet this rest of God began on the first sabbath of God, and somemen were evidently meant to enter into it. (4) Since then the original recipients of the promise had failed to enjoy it through disbelief, the promise was renewed ages afterwards, in Psalms 95 by the word "To-day." The immense stress of meaning laid on incidental Scriptural expressions was one of the features of Rabbinic as well as of Alexandrian exegesis.

from the foundation of the world God's rest had begun since the Creation.