Genesis 21:24

Abraham said, "I will swear."

Genesis 14:13

One who had escaped came and told Abram, the Hebrew. Now he lived by the oaks of Mamre, the Amorite, brother of Eshcol, and brother of Aner; and these were allies of Abram.

Romans 12:18

If it is possible, as much as it is up to you, be at peace with all men.

Hebrews 6:16

For men indeed swear by a greater one, and in every dispute of theirs the oath is final for confirmation.

Treasury of Scripture Knowledge

Summary

And Abraham said, I will swear.

Bible References

General references

Genesis 14:13
One who had escaped came and told Abram, the Hebrew. Now he lived by the oaks of Mamre, the Amorite, brother of Eshcol, and brother of Aner; and these were allies of Abram.
Romans 12:18
If it is possible, as much as it is up to you, be at peace with all men.
Hebrews 6:16
For men indeed swear by a greater one, and in every dispute of theirs the oath is final for confirmation.