Deuteronomy 32:8-9 -

From the very beginning, when God first allotted to the nations a place and a heritage, he had respect in his arrangements to the sons of Israel, who were his portion, and had as it were kept their interest in view in all that he appointed and ordered. According to the number of the children of Israel. When the Most High portioned out to the nations the heritage of each, he reserved for Israel, as the people of his choice, an inheritance proportioned to its numbers. The LXX . has "according to the number of the angels of God," an arbitrary departure from the original text, in accommodation, probably, to the later Jewish notion of each nation having its guardian angel. The Lord's portion is his people (cf. Exodus 15:16 ; Exodus 19:5 ; 1 Samuel 10:1 ; Psalms 78:71 ). The lot of his inheritance ; literally, the cord , etc; the allusion being to the measuring of land by a cord, equivalent to the portion by measure which Jehovah allotted to himself as his inheritance (cf. Psalms 16:6 ).