Hebrews 6:16
For people make vows by someone greater [than themselves], and an argument is settled when someone takes an oath [that he is telling the truth].
Matthew 23:20-22
The person, therefore, who takes an oath 'by the Altar,' [not only] swears by it, but [also] by everything on it.
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,
Treasury of Scripture Knowledge
Summary
For men verily swear by the greater: and an oath for confirmation is to them an end of all strife.
General references
Bible References
General references
Luke 1:73
[This Agreement was] the oath by which He swore to Abraham, our forefather,