1 Kings 2:43

and wherefore hast thou not kept the oath of Jehovah, and the charge that I charged upon thee?'

2 Samuel 21:2

And the king calleth for the Gibeonites, and saith unto them -- as to the Gibeonites, they are not of the sons of Israel, but of the remnant of the Amorite, and the sons of Israel had sworn to them, and Saul seeketh to smite them in his zeal for the sons of Israel and Judah --

2 Chronicles 30:12

Also, in Judah hath the hand of God been to give to them one heart to do the command of the king and of the heads, in the matter of Jehovah;

Ecclesiastes 8:2

I pray thee, the commandment of a king keep, even for the sake of the oath of God.

Ezekiel 17:18-19

And he despised the oath -- to break covenant, And lo, he hath given his hand, And all these he hath done, he escapeth not.

Romans 13:5

Wherefore it is necessary to be subject, not only because of the wrath, but also because of the conscience,

Treasury of Scripture Knowledge

Summary

Why then hast thou not kept the oath of the LORD, and the commandment that I have charged thee with?

Bible References

Why

2 Samuel 21:2
And the king calleth for the Gibeonites, and saith unto them -- as to the Gibeonites, they are not of the sons of Israel, but of the remnant of the Amorite, and the sons of Israel had sworn to them, and Saul seeketh to smite them in his zeal for the sons of Israel and Judah --
Ezekiel 17:18
And he despised the oath -- to break covenant, And lo, he hath given his hand, And all these he hath done, he escapeth not.

Commandment

2 Chronicles 30:12
Also, in Judah hath the hand of God been to give to them one heart to do the command of the king and of the heads, in the matter of Jehovah;
Ecclesiastes 8:2
I pray thee, the commandment of a king keep, even for the sake of the oath of God.
Romans 13:5
Wherefore it is necessary to be subject, not only because of the wrath, but also because of the conscience,