How do Protestant Christians understand the “Sabbath-rest for the people of God” in Hebrews chapter 4? So then, there remains a Sabbath rest for the people of God, for whoever has entered God's rest has also rested from his works as God did from his. (Hebrews 4:9-10)

What are God’s conditions for entering into this Sabbath rest for His people, since God declared that some shall never enter His rest?

So I declared on oath in my anger, ‘They shall never enter my rest.’ (Psalm 95:7-8)

What does it mean for Protestant Christians to enter into the Sabbath rest for God's people as described in Hebrews chapter 4?
What does it mean for Protestant Christians to enter into the Sabbath rest for God's people as described in Hebrews chapter 4?
Since joining mainstream Protestantism in the 1980s (baptised in a British Baptist church), I soon learned from many a sermon that the idea of this ‘Sabbath rest for God’s people’ has a two-fold aspect.
(1) Resting from their own works by trusting utterly in the finished work of Christ on the cross. Christians do good works but not in order to enter into God’s rest; on the contrary, supposing that one must do things in order to be at peace with God results in distress – ceaseless striving to be good enough, as if what Christ had done was insufficient to bring peace with God. Spiritual ‘resting’ in Christ is the present, on-going ‘rest’ in this world where we can be at peace with God, despite all else going on around us. “O rest in the Lord, wait patiently for him... Wait on the Lord and keep his way, and he shall exalt thee to inherit the land.” (Psalm 37:7 &amp; 34)
(2) In the world to come, it will be the joyous rest of being in Heaven and actually in God’s presence, away from the strife, turmoil and often misunderstood business of just trying to live as a Christian in a largely godless world.
The points made in Hebrews 4 must include chapter 3, which is the foundation for the writer’s conclusion in 4:8-11. The example is drawn of the sin of disbelief by Israel at the borders of Canaan, which prevented them entering into God’s rest back then. Believing, acting faith is key to entering in to rest with God. Disbelief and disobedience denies us the rest God would give us. This link is made in this Protestant book (originally published in 1899; my quote is from the 1978 reprint):

“For faithful though he was, Moses was only a servant within God’s
house, while Jesus was a Son over it… the writer first of all
impresses upon his readers the need of this continued faith and
perseverance (c. iii.7-19), and then shows them that there is still a
true Sabbath-rest after which to strive, of which the rest of Canaan
offered to their fathers had given them the promise (c. iv. 1-13).”
The Theology of the Epistle to the Hebrews by George Milligan (p 62)

A 2011 Protestant book detailing core doctrines for Christian disciples makes the same point:

“Paul’s legalists had misunderstood the true nature of the law: to
lead us to Christ, not to lead us to self-salvation. The demand for
faith does not turn faith into a work. On the contrary, it is a
command to cease our labors and enter God’s rest (Heb. 4:10). We are
commanded to repent not only of our immoral life that we once approved
but of self-trust, which is the greatest sin of all – the chief form
of idolatry.” (p 267) “The Everlasting Sabbath of the New Heavens and
Earth is the heading on p 452. Pilgrim Theology by Michael Horton,
Zondervan

The Sabbath is a day of rest, and the literal 7th day of the week rest of the old testament becomes, for the Christian, the 7-day-a-week rest of peace with God due to the finished work of Christ on the cross. A Christian who rests in faith while being busy working for the Lord knows this non-legalistic constant rest of faith even now, on earth. Then, in the Everlasting Sabbath to come, the words of Revelation 14:12-13 could not be more inspirational:

“Here is the patience of the saints: here are they that keep the
commandments of God, and the faith of Jesus. And I heard a voice from
heaven saying unto me, Write, Blessed are the dead which die in the
Lord from henceforth: Yea, saith the Spirit, that they may rest from
their labours; and their works do follow them.”

The condition for entering into that Sabbath rest of Hebrews 4:9-10 is active, believing faith.