Paul said in Ephesians 2: 11 Wherefore remember, that ye being in time past Gentiles in the flesh, who are called Uncircumcision by that which is called the Circumcision in the flesh made by hands; 12 that at that time ye were without Christ, being aliens from the commonwealth of Israel, and strangers from the covenants of promise, having no hope, and without God in the world: 13 but now in Christ Jesus ye who sometimes were far off are made nigh by the blood of Christ.18 For through him we both have access by one Spirit unto the Father. 19 Now therefore ye are no more strangers and foreigners, but fellowcitizens with the saints, and of the household of God; 20 - And are built upon the foundation of the apostles and prophets, Jesus Christ himself being the chief corner stone;
The foundation of the church started in the wilderness on the seventh day of the week, Stephen mention that in Acts 7:38 - This is he, that was in the church in the wilderness with the angel which spake to him in the mount Sina, and with our fathers: who received the lively oracles to give unto us:
Which is still good to this day, any other day is not of God and you can't read it in the word of God!
We understand that Peter said in 2Peter 1:19 We have also a more sure word of prophecy; whereunto ye do well that ye take heed, as unto a light that shineth in a dark place, until the day dawn, and the day star arise in your hearts: 1:20 Knowing this first, that no prophecy of the scripture is of any private interpretation. 1:21 For the prophecy came not in old time by the will of man: but holy men of God spake as they were moved by the Holy Ghost.
Peter is letting us know that prophecy, from Genesis to Malachi is more surer then the New Testament. Let see how Paul word it in Ephesians 2: 19 Now therefore ye are no more strangers and foreigners, but fellowcitizens with the saints, and of the household of God; 20 And are built upon the foundation of the apostles and prophets, Jesus Christ himself being the chief corner stone;
So is Paul telling the Gentiles how important the old testament is, and how they have the same laws as Israel do. In the scriptures it's written in Isaiah 8: 20 To the law and to the testimony: if they speak not according to this word, it is because there is no light in them.
Now lets go into the future, in Ezekiel 44: 6 And thou shalt say to the rebellious, even to the house of Israel, Thus saith the Lord GOD; O ye house of Israel, let it suffice you of all your abominations,7 In that ye have brought into my sanctuary strangers, uncircumcised in heart, and uncircumcised in flesh, to be in my sanctuary, to pollute it, even my house, when ye offer my bread, the fat and the blood, and they have broken my covenant because of all your abominations.8 And ye have not kept the charge of mine holy things: but ye have set keepers of my charge in my sanctuary for yourselves. 9 Thus saith the Lord GOD; No stranger, uncircumcised in heart, nor uncircumcised in flesh, shall enter into my sanctuary, of any stranger that is among the children of Israel.