Hebrews 3:18

“And to whom sware he that they should not enter into his rest, etc..] As in (<199511>Psalm 95:11 (see Gill on “<580311>Hebrews 3:11”)), but to them that believed not? the Lord; notwithstanding the signs and wonders he showed among them, they would not be persuaded by Moses and Aaron, by Joshua and Caleb, to be still and quiet, to cease murmuring, and submit to the will of God, and believe in him; they were disobedient, stubborn, and rebellious, and would go up, when they were bid not to go up; for which reason God swore in his wrath that they should not enter into the good land. Unbelief is a source of sin, and cause of judgment, being greatly provoking to God.”

“to them that believed not--rather as Greek, "to them that disobeyed." Practical unbelief (Deu 1:26).”

“And to whom sware he - note, Hebrews 3:11. But to them that believed not - That did not confide in God; Deuteronomy 1:32. “Yet in this thing ye did not believe the Lord your God.” In consequence of this want of faith, God solemnly sware unto them that they should not enter into the promised land; Deuteronomy 1:34-35. “And the Lord heard the voice of your words, and was wroth, and sware, saying, “Surely there shall not one of these men of this evil generation see that good land which I sware to give unto your fathers, save Caleb,” etc. The distinct reason, therefore, assigned by Moses why they did not enter the promised land, was a want of faith, and this accords directly with the design of…”

“to whom: Heb 3:11; Num 14:30; Deu 1:34, Deu 1:35 but: Num 14:11, Num 20:12; Deu 1:26-32, Deu 9:23; Psa 106:24-26 Hebrews 3:19”