Deuteronomy 19:8

8 "When the Lord your God enlarges your territory, as he told your ancestors he would, and gives you all the land he has promised,

Deuteronomy 19:8 Meaning and Commentary

Deuteronomy 19:8

And if the Lord thy God enlarge thy coast
Extend it further than it was upon their first settlement, even carry it as far as the river Euphrates, as in the times of Solomon, ( 1 Kings 4:21 1 Kings 4:24 ) . Jarchi interprets it of such an enlargement as to give them the land of the Kenites, the Kenizzites and Kadmonites:

(as he hath sworn unto thy fathers), and give thee all the land which
he promised to give unto thy, fathers:
Abraham, Isaac, and Jacob; see ( Genesis 15:19 ) ( Genesis 26:3 Genesis 26:4 ) ( Genesis 28:13 Genesis 28:14 ) .

Deuteronomy 19:8 In-Context

6 If there were only one city, the distance to it might be too great, and the relative who is responsible for taking revenge for the killing might catch you and angrily kill an innocent person. After all, it was by accident that you killed someone who was not your enemy.

7 This is why I order you to set aside three cities.

8 "When the Lord your God enlarges your territory, as he told your ancestors he would, and gives you all the land he has promised,

9 then you are to select three more cities. (He will give you this land if you do everything that I command you today and if you love the Lord your God and live according to his teachings.)

10 Do this, so that innocent people will not die and so that you will not be guilty of putting them to death in the land that the Lord is giving you.