Revelation 14:13 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.
This verse refers specially to those believers who are killed by the anti-Christ government during the Tribulation period, but before the Seven Bowls of Wrath. The totality of Tribulation Period saints are in, and martyred. During the Seven Bowls of Wrath there will no one be saved, for all are destined for and are experiencing the wrath of God.
Ephesians 4:1 I therefore, the prisoner of the Lord, beseech you that ye walk worthy of the vocation wherewith ye are called, ...
Ephesians is one of Paul's 'prison epistles". He wrote them while a prisoner in Rome.
Notice however that he doesn't describe himself as a prisoner of Caesar (though such he was in terms of earthly law).
Rather he describes himself as "the prisoner of the Lord" (not, as the ESV puts it, "a prisoner for the Lord").
Paul is not asking his readers to reckon themselves dead indeed to sin, after they've verified that it is so, but before they've seen any evidence!
Matthew 11:28 Come unto me, all ye that labour and are heavy laden, and I will give you rest.
29 Take my yoke upon you, and learn of me; for I am meek and lowly in heart: and ye shall find rest unto your souls.
Jesus said, "Come to Me."
He did not invite people to a church or group. Nor to a teaching.
Jesus said, "Come unto Me", and, in the next verse, "learn of Me".
The promise "I will give you rest" is to those who come and learn.
No one else can give you His rest. He said, "I will give you rest."