Hebrews 6:13

For when God made his promise to Abraham, since there was no one greater for him to make oath by, he did so by himself,

Luke 1:73

"And the oath that he swore to our forefather Abraham,

Hebrews 6:16-18

For men make oath by something greater than themselves, and they accept an oath as settling finally any disagreement they may have.

Treasury of Scripture Knowledge

Summary

For when God made promise to Abraham, because he could swear by no greater, he sware by himself,

General references

Bible References

He sware

Hebrews 6:16
For men make oath by something greater than themselves, and they accept an oath as settling finally any disagreement they may have.
Luke 1:73
"And the oath that he swore to our forefather Abraham,

General references

Revelation 10:6
and swore by him who lives forever and ever, who created the heavens and all that is in them, the earth and all that is in it, and the sea and all that is in it, that there should be no more delay,