Hebrews 6:13
For when God made a promise to Abraham, since He could not make a vow by anyone greater, He vowed by Himself,
Hebrews 3:18
And to whom did God vow that they would not enter a state of rest with Him? [Was it not] those who were disobedient to Him?
Hebrews 6:17
Since God wanted to show conclusively to those who would inherit the promise [i.e., Abraham and all of his spiritual descendants], how unchangeable His purpose was, He confirmed it with an oath.
Treasury of Scripture Knowledge
Summary
But if ye will not hear these words, I swear by myself, saith the LORD, that this house shall become a desolation.
Bible References
I
Hebrews 3:18
And to whom did God vow that they would not enter a state of rest with Him? [Was it not] those who were disobedient to Him?
Hebrews 6:13
For when God made a promise to Abraham, since He could not make a vow by anyone greater, He vowed by Himself,