Deuteronomy 19:8 in the King James Version
And if the LORD thy God enlarge thy coast, as he hath sworn unto thy fathers, and give thee all the land which he promised to give unto thy fathers;
Context
7 Therefore I command you to set apart three cities for yourselves.
8 If the LORD your God enlarges your border, as he has sworn to your fathers, and gives you all the land which he promised to give to your fathers;
9 and if you keep all this commandment to do it, which I command you today, to love the LORD your God, and to walk ever in his ways, then you shall add three cities more for yourselves, in addition to these three.