Deuteronomy 19:9

If thou shalt watch all this command to do it, which I command thee this day, to love Jehovah thy God and to go in his ways all the days; and thou shalt add to thee yet three cities upon these three.

Joshua 20:7-8

And they will consecrate Kadesh in Galilee in mount Naphtali, and Shechem in mount Ephraim, and the city of Arba (this in Hebron) in mount Judah.

Deuteronomy 11:22-25

For if watching, ye shall watch all this command which I command you to do it, to love Jehovah thy God, to go in all his ways, and to cleave to him;

Deuteronomy 12:32

Every word which I command you, ye shall watch to do it: thou shalt not add upon it, and thou shalt not take away from it

Treasury of Scripture Knowledge

Summary

If thou shalt keep all these commandments to do them, which I command thee this day, to love the LORD thy God, and to walk ever in his ways; then shalt thou add three cities more for thee, beside these three:

Then shalt thou

Bible References

If thou shalt

Deuteronomy 11:22
For if watching, ye shall watch all this command which I command you to do it, to love Jehovah thy God, to go in all his ways, and to cleave to him;
Deuteronomy 12:32
Every word which I command you, ye shall watch to do it: thou shalt not add upon it, and thou shalt not take away from it

Then shalt thou

Joshua 20:7
And they will consecrate Kadesh in Galilee in mount Naphtali, and Shechem in mount Ephraim, and the city of Arba (this in Hebron) in mount Judah.