None of the righteous things that person has done will be remembered. Because of the unfaithfulness they are guilty of and because of the sins they have committed, they will die. (Ezekiel 18:24)
Again Ezekiel’s message is not a apples to apples subject. We are righteous only because Christ, the Righteous one, lives in us. Period. We’ve been born into a righteous family and we didn’t deserve it. This is why eternal life is a free gift. In of ourselves it is impossible to be saved because there are NONE righteous, no, not one. Paul said in Ro. 3.
jesus said that those who endure until the end will be saved (Matthew 24:13)
This passage is taken out of it’s context. The context is the 7 year tribulation to which those persecuted by the anti-christ are challenged to “endure” his persecution to the end. The end is til the end of his persecution when God’s Son will come in His glory to save-deliver those remnant believers from their hour of trial. There is nothing in the context that answers the question about eternal life.
For we share in Christ , if only we hold our first confidence firm to the end.” Even St. Paul wasn’t completely assured of his own salvation when he said, “I force my body into submission, so that after I have preached to others, I myself may not be disqualified from winning the prize” (I Corinthians 9:27)
The Hebrew writer is concerned with the problem of those who draw back from their Christian commitment and conviction. Those who do so, of course, abandon the church (10:25.) The church is the visible household of faith from which they withdraw.
Keep in mind that the word Church from it’s Greek counterpart is the word ekklesia, a compound word to mean those who are called out. The called out ones… Called out of what?.. This distinction is crucial to understand passages like this one in Hebrews 3.
If these people in question draw back from their commitment and conviction they in essence, draw back from the Church. The “church” and the “body of Christ” are not interchangeable terms. The Church is the visible house of God, for all to see and know.
The body of Christ, on the other hand, are the souls of men universally part of God’s family to which Christ has the domain.
If the Christian withdraws from the visible functioning household, that is, from the Church itself, he ceases to be a “partner of Christ.” This is the meaning of Heb. 3:14 where the word for “partaker” is the same word as the one used in verse 1
… who’s house we are if we hold fast the confidence to the end."
You used the word “sharer” but the Greek word there is metochos meaning to partner with, or one who goes into business with. If we lose our confidence or conviction, we cease to partner His cause in the public. But this is not to say we are not united with Him as members of His universal family.