2 Corinthians 1:23

I call God to witness, and may I die if it is not true, that the reason of my not coming yet to Corinth, was to avoid using any severity towards you.

Hebrews 6:16

for when men swear by a superior, the ratifying what they say with an oath, puts an end to all further debate.

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
I call God to witness, and may I die if it is not true, that the reason of my not coming yet to Corinth, was to avoid using any severity towards you.
Hebrews 6:16
for when men swear by a superior, the ratifying what they say with an oath, puts an end to all further debate.