2 Thessalonians 2:13

But we are bound to give thanks always to God for you, brethren, beloved of the Lord, because God hath elected you from the beginning unto salvation, by sanctification of the Spirit, and faith in the truth:

Titus 1:2

in hope of life eternal, which God, who cannot lie, hath promised before time had a being;

Hebrews 6:13

For God when he gave the promise to Abraham forasmuch as he had nothing greater to swear by, sware by himself,

Hebrews 6:17

And thus God, designing more abundantly to demonstrate to the heirs of promise the immutability of his will, pledged himself by oath,

Treasury of Scripture Knowledge

Summary

Once have I sworn by my holiness that I will not lie unto David.

That i will not lie

Bible References

Once

Hebrews 6:13
For God when he gave the promise to Abraham forasmuch as he had nothing greater to swear by, sware by himself,

That i will not lie

2 Thessalonians 2:13
But we are bound to give thanks always to God for you, brethren, beloved of the Lord, because God hath elected you from the beginning unto salvation, by sanctification of the Spirit, and faith in the truth:
Titus 1:2
in hope of life eternal, which God, who cannot lie, hath promised before time had a being;