Israel.

Exodus 19:5, 6
Now if you will indeed obey My voice and keep My covenant, you will be My treasured possession out of all the nations--for the whole earth is Mine. . . .

Deuteronomy 14:1
You are sons of the LORD your God; do not cut yourselves or shave your forehead on behalf of the dead,

Jeremiah 31:9
They will come with weeping, and by their supplication I will lead them; I will make them walk beside streams of waters, on a level path where they will not stumble. For I am Israel's Father, and Ephraim is My firstborn."

Hosea 11:1
When Israel was a child, I loved him, and out of Egypt I called My son.

Romans 9:4
the people of Israel. Theirs is the adoption as sons; theirs the divine glory and the covenants; theirs the giving of the Law, the temple worship, and the promises.

2 Corinthians 6:18
And: "I will be a Father to you, and you will be My sons and daughters, says the Lord Almighty."

Hebrews 12:23
in joyful assembly, to the congregation of the firstborn, enrolled in heaven. You have come to God the judge of all men, to the spirits of the righteous made perfect,

James 1:18
He chose to give us birth through the word of truth, that we would be a kind of firstfruits of His creation.