Hebrews 6:13

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

Luke 1:73

the oath which he swore to Abraham our father,

Hebrews 6:16-18

For, verily, men swear by the greater, and an oath for confirmation is to them an end of all contradiction.

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, verily, men swear by the greater, and an oath for confirmation is to them an end of all contradiction.
Luke 1:73
the oath which he swore to Abraham our father,

General references

Revelation 10:6
and swore by him that lives from age to age, who created the heaven and the things that are in it, and the earth and the things that are in it, and the sea and the things that are in it, That time should no longer intervene,