Quote from Deuteronomy

When the Most High apportioned the nations, when he divided humankind, he fixed the boundaries of the peoples according to the number of the gods; 9 For the people of Israel belong to the LORD; Jacob is his special possession.

Deuteronomy 32, 8-9 New Revised Standard Bible / New Living Translation

NB the reference to “sons” is attested in Qumran fragments