6 Bible Verses about Gentiles, In Ot

Because the Scripture foresaw that God would bring the heathen into right standing with Himself on condition of faith, He beforehand proclaimed the good news to Abraham in the promise, "It is through you that all the heathen will be blessed." So the men of faith are blessed as partners with trusting Abraham.

for my eyes have seen your Salvation, which you prepared before all peoples, a light of revelation to the heathen, and a glory to your people Israel."

"Here is my Servant whom I have chosen, My Beloved, in whom my soul delights itself. I will endow Him with my Spirit, and He will announce a judgment to the heathen. He will not debate, nor challenge anyone; His voice will no one hear in the streets; A broken reed He will not break off; a flickering wick He will not put out, until He brings His judgment to victory.read more.
On His name the heathen will set their hopes."

And what if God, though wishing to display His anger and make known His power, yet, has most patiently borne with the objects of His anger, already ripe for destruction, so as to make known the riches of His glory for the objects of His mercy, whom He prepared in ages past to share His glory -- even us whom He has called, not only from among the Jews but from among the heathen too?read more.
Just as He says in Hosea: "I will call a people that was not mine, my people, and her who was not beloved, my beloved,

Once you were not a people, but now you are the people of God; once His mercy had not been shown you, but now it has.

and for the heathen peoples to praise God for His mercy, as the Scripture says: "For this I will give thanks to you among the heathen, and will sing praises to your name." And again: "Rejoice, you heathen peoples, with His people!" And again: "All you heathen peoples, praise the Lord, yea, let all peoples sing His praise."read more.
And again Isaiah says: "The noted Son of Jesse will come, even He who rises to rule the heathen; on Him the heathen will set their hope."