Joshua 9:20

This we will do to them, and let them live; lest wrath be upon us, because of the oath which we sware unto them.

2 Samuel 21:1-6

And there was a famine in the days of David three years, year after year; and David sought the face of Jehovah. And Jehovah said, It is for Saul, and for his bloody house, because he put to death the Gibeonites.

2 Chronicles 36:13

And he also rebelled against king Nebuchadnezzar, who had made him swear by God: but he stiffened his neck, and hardened his heart against turning unto Jehovah, the God of Israel.

Proverbs 20:25

It is a snare to a man rashly to say, It is holy, And after vows to make inquiry.

Ezekiel 17:12-21

Say now to the rebellious house, Know ye not what these things mean? tell them, Behold, the king of Babylon came to Jerusalem, and took the king thereof, and the princes thereof, and brought them to him to Babylon:

Zechariah 5:3-4

Then said he unto me, This is the curse that goeth forth over the face of the whole land: for every one that stealeth shall be cut off on the one side according to it; and every one that sweareth shall be cut off on the other side according to it.

Malachi 3:5

And I will come near to you to judgment; and I will be a swift witness against the sorcerers, and against the adulterers, and against the false swearers, and against those that oppress the hireling in his wages, the widow, and the fatherless, and that turn aside the sojourner from his right , and fear not me, saith Jehovah of hosts.

Romans 1:31

without understanding, covenant-breakers, without natural affection, unmerciful:

1 Timothy 1:10

for fornicators, for abusers of themselves with men, for menstealers, for liars, for false swearers, and if there be any other thing contrary to the sound doctrine;

Treasury of Scripture Knowledge

Summary

This we will do to them; we will even let them live, lest wrath be upon us, because of the oath which we sware unto them.

Bible References

Lest wrath

2 Samuel 21:1
And there was a famine in the days of David three years, year after year; and David sought the face of Jehovah. And Jehovah said, It is for Saul, and for his bloody house, because he put to death the Gibeonites.
2 Chronicles 36:13
And he also rebelled against king Nebuchadnezzar, who had made him swear by God: but he stiffened his neck, and hardened his heart against turning unto Jehovah, the God of Israel.
Proverbs 20:25
It is a snare to a man rashly to say, It is holy, And after vows to make inquiry.
Ezekiel 17:12
Say now to the rebellious house, Know ye not what these things mean? tell them, Behold, the king of Babylon came to Jerusalem, and took the king thereof, and the princes thereof, and brought them to him to Babylon:
Zechariah 5:3
Then said he unto me, This is the curse that goeth forth over the face of the whole land: for every one that stealeth shall be cut off on the one side according to it; and every one that sweareth shall be cut off on the other side according to it.
Malachi 3:5
And I will come near to you to judgment; and I will be a swift witness against the sorcerers, and against the adulterers, and against the false swearers, and against those that oppress the hireling in his wages, the widow, and the fatherless, and that turn aside the sojourner from his right , and fear not me, saith Jehovah of hosts.
Romans 1:31
without understanding, covenant-breakers, without natural affection, unmerciful:
1 Timothy 1:10
for fornicators, for abusers of themselves with men, for menstealers, for liars, for false swearers, and if there be any other thing contrary to the sound doctrine;

American Standard Version Public Domain