2 Corinthians 1:23

But I appeal to God as a witness unto my soul, that to spare you I have not yet come to Corinth:

Hebrews 6:16

For men indeed swear by something greater than themselves; and an oath for confirmation is with them conclusive in all disputes.

Treasury of Scripture Knowledge

Summary

Now therefore swear unto me here by God that thou wilt not deal falsely with me, nor with my son, nor with my son's son: but according to the kindness that I have done unto thee, thou shalt do unto me, and to the land wherein thou hast sojourned.

Bible References

Swear

2 Corinthians 1:23
But I appeal to God as a witness unto my soul, that to spare you I have not yet come to Corinth:
Hebrews 6:16
For men indeed swear by something greater than themselves; and an oath for confirmation is with them conclusive in all disputes.