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Those Hebrews passages - again - do not refer to salvation. Matters not if the TERM is not in Scripture. It’s clear from the passages and AFTER that the author is NOT referencing those who are saved/redeemed (if you prefer). We cannot keep ourselves. Yes, we have a responsibility to follow Him. Just like we are commanded to “Repent and Believe”, although Scripture makes it clear that salvation is of the Lord and NO ONE seeks after God, no not one (Romans 3),

Philippians 1:6 shows who keeps us, as does John 6 (v. 39) and John 10:28-29 (and I give eternal life to them, and they will never perish; and no one will snatch them out of My hand. 29 [a]My Father, who has given them to Me, is greater than all; and no one is able to snatch them out of the Father’s hand.). Romans 5 - “....having now been justified” (eternity past). Josh Harris is not more powerful than the Savior who keeps us, God be praised.

1 John 2:19 “They went out from us, but they were not really of us; for if they had been of us, they would have remained with us; but they went out, so that [d]it would be shown that they all are not of us.”

Those Hebrews passages - again - do not refer to salvation. ...
We cannot keep ourselves. ...
NO ONE seeks after God, no not one...

Of course they refer to salvation. They were made partakers of the Holy Spirit. However, one must endure to the end to be saved. It is not the beginning that counts, it is the ending.

For we are made partakers of Christ, if we hold the beginning of our confidence stedfast unto the end;

...

But ye, beloved, building up yourselves on your most holy faith, praying in the Holy Ghost,
Keep yourselves in the love of God, looking for the mercy of our Lord Jesus Christ unto eternal life.

...

God that made the world and all things therein, seeing that he is Lord of heaven and earth, dwelleth not in temples made with hands;
Neither is worshipped with men's hands, as though he needed any thing, seeing he giveth to all life, and breath, and all things;
And hath made of one blood all nations of men for to dwell on all the face of the earth, and hath determined the times before appointed, and the bounds of their habitation;
That they should seek the Lord, if haply they might feel after him, and find him, though he be not far from every one of us:
For in him we live, and move, and have our being; as certain also of your own poets have said, For we are also his offspring.

Hebrews, Catholic chapter three, Protestant verse fourteen,
Jude, Catholic chapter one, Protestant verses twenty to twenty one,
Acts, Catholic chapter seventeen, Protestant verses twenty four to twenty eight,
as authorized, but not authored, by King James