The Jews overlooked the Spiritual Dealings of God in the Old Testament, which is why they don’t see a lot of truth that can resonate with us Christians.
Galatians 3:2 This only would I learn of you, Received ye the Spirit by the works of the law, or by the hearing of faith? cf Ezekiel 18: 27
The Jews in the Old Testament did not acquire the Holy Spirit like how we Christians do. They would have to abide by the physical law. Nonetheless, many people mixed up both the Physical dealings of the Jews and Spiritual dealings of us Christians.
The Spiritual nature of the Jews in the Old testament was dead, so God had to determine their salvation with physical deeds and actions, whereas Paul couldn’t do that, as the law could not give us righteousness because of our spiritual nature.
Romans 8:3-4 For what the law could not do, in that it was weak through the flesh, God sending his own Son in the likeness of sinful flesh, and for sin, condemned sin in the flesh: That the righteousness of the law might be fulfilled in us, who walk not after the flesh, but after the Spirit.
In Romans 3, Paul talked about the law that could not give us righteousness and eternal life. It is through our spiritual nature that we are alive, and that we can attain that spiritual perfection through Christ Jesus, and the Old Testament Saints couldn’t. However, no matter how much work they did, it is still considered as filthy rags and weak as compared to what Jesus did for us.
Acts 15:10 Now therefore why tempt ye God, to put a yoke upon the neck of the disciples, which neither our fathers nor we were able to bear?
Deuteronomy 6:24-25 And the Lord commanded us to do all these statutes, to fear the Lord our God, for our good always, that he might preserve us alive, as it is at this day. And it shall be our righteousness, if we observe to do all these commandments before the Lord our God, as he hath commanded us.
The Old and New Testament have two different perspectives about God’s standards of spiritual perfection. In the Old Testament, No one could keep the whole law for salvation in spiritual perfection until Jesus Christ came for us.
In Matthew 19:16-21, Jesus talked about the physical works and deeds that they needed to do, because Jesus had yet to die for us on the cross. Lordship Salvation believers would use these verses to argue that we have abide and comply with these instructions for salvation.
The greatest thing we should do when witnessing to Jews, is to use Jewish law in the Old Testament as a reference, such as blood sacrifice for the forgiveness of sin, as well as flesh circumcision, to show them that those are no longer the foundation of salvation now anymore. That their salvation cannot be justified by such works.
Hebrews 9:19 For when Moses had spoken every precept to all the people according to the law, he took the blood of calves and of goats, with water, and scarlet wool, and hyssop, and sprinkled both the book, and all the people,
There was no forgiveness for the Old Testaments Saints without the sacrifice of the animal’s blood. With the burnt and sin offerings, only can their sins can be pardoned and attain a clean slate.
A lot of Jews do not believe in the Heaven, because they only came across Abraham’s bosom in the Old Testament for the saints. Due to their physical nature and dealings with God, God could only put them in this temporary place until Jesus came and bring them out of the bosom.
Luke 23:43 And Jesus said unto him, Verily I say unto thee, To day shalt thou be with me in paradise. cf Matthew 12:40
Jesus meant the center of the earth, which means Abraham’s bosom where hell was located even though he mentioned Paradise. Even though Abraham’s bosom was located in Hell, nonetheless it was a place temporarily for the righteous saints in the Old Testament, and that they did not have to suffer there.