Deuteronomy 19:9

King James 3 - The Literal Traslation

if you will keep these commandments which I am commanding you today, to love Jehovah your God, and to walk in His ways forever, then you shall add to yourself another three cities to these three.

Cross References

Deuteronomy 12:32

All the things that I command you, take heed to do them, and you shall not add to it and not take away from it.

Deuteronomy 6:5

And you shall love Jehovah your God with all your heart, and with all your soul, and with all your might.