Genesis 21:24

Then said Abraham, "I will swear."

Genesis 14:13

Then came one that had escaped, and told Abram the Hebrew; which dwelt in the oak grove of Mamre the Amorite, brother of Eshcol and Aner, which were confederate with Abram.

Romans 12:18

If it be possible, howbeit of your part, have peace with all men.

Hebrews 6:16

Men verily swear by him that is greater than themselves; And an oath to confirm the thing, is among them an end of all strife.

Treasury of Scripture Knowledge

Summary

And Abraham said, I will swear.

Bible References

General references

Genesis 14:13
Then came one that had escaped, and told Abram the Hebrew; which dwelt in the oak grove of Mamre the Amorite, brother of Eshcol and Aner, which were confederate with Abram.
Romans 12:18
If it be possible, howbeit of your part, have peace with all men.
Hebrews 6:16
Men verily swear by him that is greater than themselves; And an oath to confirm the thing, is among them an end of all strife.