Hebrews 6:13

For when God gave the promise to Abraham, since He had no one greater to swear by, He swore by Himself,

Luke 1:73

The oath which He swore to Abraham our forefather,

Hebrews 6:16-18

For men swear by what is greater than themselves; and with them an oath in confirmation of a statement always puts an end to a dispute.

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 swear by what is greater than themselves; and with them an oath in confirmation of a statement always puts an end to a dispute.
Luke 1:73
The oath which He swore to Abraham our forefather,

General references

Revelation 10:6
And in the name of Him who lives until the Ages of the Ages, the Creator of Heaven and all that is in it, of the earth and all that is in it, and of the sea and all that is in it, he solemnly declared,