I will be blunt, because I have said it many times. The factual and biblical truth is that NONE of the OC saints were allowed to have the permanent indwelling of the Holy Spirit at any time. (Malachi 3:16, fulfillment Rev. 6:9-11). It's a literal and spiritual impossibility!The blood of Christ making atonement for sin has always been the only way to be saved. The blood of Christ made atonement for men/women of faith, like Abraham by hearing the Word of God and believing even from Old. The Old Covenant saints were saved by Christ's atoning blood before one drop was poured out. They were saved according to the promise of God, that can NEVER fail! That's why God preached the Gospel to Abraham, and according to grace through imputed faith Abraham believed God and was accounted righteous before God. Through faith Abraham was saved and blessed by God long before Christ came. Abraham was saved through hope, that is in knowing that God is faithful and none of His promises will fail.
Galatians 3:6-9 (KJV) Even as Abraham believed God, and it was accounted to him for righteousness. Know ye therefore that they which are of faith, the same are the children of Abraham. And the scripture, foreseeing that God would justify the heathen through faith, preached before the gospel unto Abraham, saying, In thee shall all nations be blessed. So then they which be of faith are blessed with faithful Abraham.
The prophets foretold of the Messiah who would come to redeem those of faith from sin and death. This doctrine was well known to the Old Covenant nation. That which was not clearly understood was that the Old ceremonial and sacrificial system under the Law was no longer the way for Jews to be temporarily cleansed of sins. That did not before well known until after the body of Christ, the true Temple was destroyed. After that all the Jews of faith, having the Holy Spirit understood the Old was gone forever and the New Covenant in His blood began.
Hebrews 9:8 (KJV) The Holy Ghost this signifying, that the way into the holiest of all was not yet made manifest, while as the first tabernacle was yet standing:
That situation could NOT take place, not ever, UNTIL AFTER the Blood of Christ was shed. There is no other way that anyone can be made Holy enough, for the permanent indwelling of the Holy righteousness of God to LIVE in them. None were ever made that Holy, no matter how much faith they had.
Again, a "Promise" is not established until the manifestation of its practical working is ratified (made effective).