Their example is an encouragement to us that no matter the circumstances, they did not forsake assembling together as a church to worship their risen Lord as God (Heb. 10:25)!
Epistle of Barnabas (ca. 80-120 A.D.)
The Epistle of Barnabas was written no later than 120 A.D., but it is doubted if the author thereof was Barnabas the companion of Paul. Either way, it comes from the first century and beginning of the second, reflecting beliefs at that time. It discusses a lot of things, including the Sabbath. In CHAPTER 15, we read:
Further, also, it is written concerning the Sabbath in the Decalogue which [the Lord] spoke, face to face, to Moses on Mount Sinai, “And sanctify ye the Sabbath of the Lord with clean hands and a pure heart.” [Ex. 20:8; Deut. 5:12] And He says in another place, “If my sons keep the Sabbath, then will I cause my mercy to rest upon them.” [Jer. 17:24-25] The Sabbath is mentioned at the beginning of the creation [thus]: “And God made in six days the works of His hands, and made an end on the seventh day, and rested on it, and sanctified it.” [Gen. 2:2] Attend, my children, to the meaning of this expression, “He finished in six days.” This implieth that the Lord will finish all things in six thousand years, for a day is with Him a thousand years. And He Himself testifieth, saying, “Behold, to-day will be as a thousand years.” [Ps 90:4; 2Pet. 3:8] Therefore, my children, in six days, that is, in six thousand years, all things will be finished. “And He rested on the seventh day.” This meaneth: when His Son, coming [again], shall destroy the time of the wicked man, and judge the ungodly, and change the sun, and the moon, and the stars, then shall He truly rest on the seventh day. Moreover, He says, “Thou shalt sanctify it with pure hands and a pure heart.” [Ps. 24:4] If, therefore, any one can now sanctify the day which God hath sanctified, except he is pure in heart in all things, we are deceived. Behold, therefore: certainly then one properly resting sanctifies it, when we ourselves, having received the promise, wickedness no longer existing, and all things having been made new by the Lord, shall be able to work righteousness. Then we shall be able to sanctify it, having been first sanctified ourselves. Further, He says to them, “Your new moons and your Sabbaths I cannot endure.” [Isa. 1:13] Ye perceive how He speaks: Your present Sabbaths are not acceptable to Me, but that is which I have made, [namely this,] when, giving rest to all things, I shall make a beginning of the eighth day, that is, a beginning of another world. Wherefore, also, we keep the eighth day with joyfulness, the day also on which Jesus rose again from the dead. And when He had manifested Himself, He ascended into the heavens.
[Scriptural references were added and the footnote references taken away.]
This is certainly interesting in many ways. The author begins by pointing to the Sabbath of the Decalogue and he connects that with the Sabbath at the creation, on the seventh day and God's rest thereon. And then he says something very weird, namely, the idea that the world will be finished in the seventh millennium after the creation. The idea is that the world shall last as long as the days of creation lasted: 6 days work, 1 day rest. Therefore, the seventh millennium is the eternal state (this passage is in no way supportive of the Premillennial scheme o...