I found it necessary to write to you exhorting you to contend earnestly for the faith which was once for all delivered to the saints [in Jerusalem, not Rome].
"Thus saith Yahweh, stand ye in the ways, and see, and ask for the old paths, where is the good way, and walk there in, and ye shall find rest to your souls. But they said, we will not walk therein."
O LORD, my strength and my fortress, My refuge in the day of affliction, The Gentiles shall come to You From the ends of the earth and say, "Surely our fathers have inherited lies, Worthlessness and unprofitable things."
19 What am I saying then? That an idol is anything, or what is offered to idols is anything? 20 Rather, that the things which the Gentiles sacrifice they sacrifice to demons and not to God, and I do not want you to have fellowship with demons. 21 You cannot drink the cup of the Lord and the cup of demons; you cannot partake of the Lord’s table and of the table of demons.
2 Corinthians 6:14-18
14 Do not be unequally yoked together with unbelievers. For what fellowship has righteousness with lawlessness? And what communion has light with darkness? 15 And what accord has Christ with Belial? Or what part has a believer with an unbeliever? 16 And what agreement has the temple of God with idols? For you are the temple of the living God. As God has said:
"I will dwell in them
And walk among them.
I will be their God,
And they shall be My people."
2 Chronicles 30:1-11
1 And Hezekiah sent to all Israel and Judah, and also wrote letters to Ephraim and Manasseh, that they should come to the house of the LORD at Jerusalem, to keep the Passover to the LORD God of Israel. 2 For the king and his leaders and all the assembly in Jerusalem had agreed to keep the Passover in the second month. 3 For they could not keep it at the regular time, because a sufficient number of priests had not consecrated themselves, nor had the people gathered together at Jerusalem. 4 And the matter pleased the king and all the assembly. 5 So they resolved to make a proclamation throughout all Israel, from Beersheba to Dan, that they should come to keep the Passover to the LORD God of Israel at Jerusalem, since they had not done it for a long time in the prescribed manner.
6 Then the runners went throughout all Israel and Judah with the letters from the king and his leaders, and spoke according to the command of the king: "Children of Israel, return to the LORD God of Abraham, Isaac, and Israel; then He will return to the remnant of you who have escaped from the hand of the kings of Assyria. 7 And do not be like your fathers and your brethren, who trespassed against the LORD God of their fathers, so that He gave them up to desolation, as you see. 8 Now do not be stiff-necked, as your fathers were, but yield yourselves to the LORD; and enter His sanctuary [this includes the Land of Israel where Israelite representatives ought to be encouraged to move to], which He has sanctified forever, and serve the LORD your God, that the fierceness of His wrath may turn away from you. 9 For if you return to the LORD, your brethren and your children will be treated with compassion by those who lead them captive, so that they may come back to this land; for the LORD your God is gracious and merciful, and will not turn His face from you if you return to Him."
10 So the runners passed from city to city through the country of Ephraim and Manasseh, as far as Zebulun; but they laughed at them and mocked them [often this is the same response the servants of God receive today by our proud and stubborn Israelite peoples who prefer their Gentile traditions to biblical truth and by smug Jewish brethren who want to remain exclusivist]. 11 Nevertheless some from Asher, Manasseh, and Zebulun humbled themselves and came to Jerusalem.