Understanding 1 Peter 1:1-2

Hear this word that the LORD has spoken against you, O children of Israel, against the whole family which I brought up from the land of Egypt, saying: “You only have I known of all the families of the earth; Therefore I will punish you for all your iniquities.”
Amos 3:1,2 NKJV -----Foreknown?

I say then, has God cast away His people? Certainly not! For I also am an Israelite, of the seed of Abraham, of the tribe of Benjamin. God has not cast away His people whom He foreknew. Rom 11:1,2 NKJV -----Foreknown?

“Have you not considered what these people have spoken, saying, ‘The two families which the LORD has chosen, He has also cast them off’? Thus they have despised My people, as if they should no more be a nation before them. “Thus says the LORD: ‘If My covenant is not with day and night, and if I have not appointed the ordinances of heaven and earth, ‘then I will cast away the descendants of Jacob and David My servant, so that I will not take any of his descendants to be rulers over the descendants of Abraham, Isaac, and Jacob. For I will cause their captives to return, and will have mercy on them.’ ” Jeremiah 33:24-26 NKJV

Israel is swallowed up;
Now they are among the Gentiles
Like a vessel in which is no pleasure. Hosea 8:8 NKJV

In 4 BC where is the house of Judah, where is the house of Israel? Where are that, today?

“Therefore say to the house of Israel, ‘Thus says the Lord GOD: “I do not do this for your sake, O house of Israel, but for My holy name’s sake, which you have profaned among the nations wherever you went. “And I will sanctify My great name, which has been profaned among the nations, which you have profaned in their midst; and the nations shall know that I am the LORD,” says the Lord GOD, “when I am hallowed in you before their eyes. “For I will take you from among the nations, gather you out of all countries, and bring you into your own land. “Then I will sprinkle clean water on you, and you shall be clean; I will cleanse you from all your filthiness and from all your idols. “I will give you a new heart and put a new spirit within you; I will take the heart of stone out of your flesh and give you a heart of flesh. “I will put My Spirit within you and cause you to walk in My statutes, and you will keep My judgments and do them. Ezek 36:22-27 NKJV

and there having been much disputing, Peter having risen up said unto them, 'Men, brethren, ye know that from former days, God among us did make choice, through my mouth, for the nations [Gentiles] to hear the word of the good news, and to believe; and the heart-knowing God did bare them testimony, having given to them the Holy Spirit, even as also to us, and did put no difference also between us and them, by [to (dative) the faith, having purified their hearts; Acts 15:7-9 YLT
V 15 Simeon did declare how at first God did look after to take out of the nations [Gentiles see Hosea 8 & Ezek 36] a people for His name,

Romans 8:23 NKJV Not only that, but we also who have the first-fruit of the Spirit, even we ourselves groan within ourselves, eagerly waiting for the adoption, the redemption of our body.

Peter, an apostle of Jesus Christ, to the choice sojourners of the dispersion [Ezek 36?] of Pontus, Galatia, Cappadocia, Asia, and Bithynia, according to a foreknowledge of God the Father, in sanctification of the Spirit, [Ezek 36, Acts 15, Rom 8?] to obedience and sprinkling of the blood of Jesus Christ: Grace to you and peace be multiplied! 1 Peter 1:1,2 YLT

James 1:1 YLT James, of God and of the Lord Jesus Christ a servant, to the Twelve Tribes who are in the dispersion: Hail!
V-18 having counselled, He did beget us with a word of truth, for our being a certain first-fruit of His creatures.

 

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They tell exactly who 1 peter is speaking of, IMHO.