2 Peter 2:20-22
20 For if after they have escaped the defilements of the world by the knowledge of the Lord and Savior Jesus Christ, they are again entangled in them and are overcome, the last state has become worse for them than the first. 21 For it would be better for them not to have known the way of righteousness, than having known it, to turn away from the holy commandment delivered to them. 22 It has happened to them according to the true proverb, "A dog returns to its own vomit," and, "A sow, after washing, returns to wallowing in the mire."
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Rev 2:7
7'He who has an ear, let him hear what the Spirit says to the churches. To him who overcomes, I will grant to eat of the tree of life, which is in the Paradise of God.'
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Rev 2:11
11'He who has an ear, let him hear what the Spirit says to the churches. He who overcomes shall not be hurt by the second death.'
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Rev 2:26-29
26'And he who overcomes, and he who keeps My deeds until the end, to him I will give authority over the nations; 27 and he shall rule them with a rod of iron, as the vessels of the potter are broken to pieces, as I also have received authority from My Father; 28 and I will give him the morning star. 29'He who has an ear, let him hear what the Spirit says to the churches.'
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Rev 3:5-6
5'He who overcomes shall thus be clothed in white garments; and I will not erase his name from the book of life, and I will confess his name before My Father, and before His angels. 6'He who has an ear, let him hear what the Spirit says to the churches. '
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Rev 3:12-13
12'He who overcomes, I will make him a pillar in the temple of My God, and he will not go out from it anymore; and I will write upon him the name of My God, and the name of the city of My God, the new Jerusalem, which comes down out of heaven from My God, and My new name. 13'He who has an ear, let him hear what the Spirit says to the churches.'
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Rev 3:20-22
21'He who overcomes, I will grant to him to sit down with Me on My throne, as I also overcame and sat down with My Father on His throne. 22'He who has an ear, let him hear what the Spirit says to the churches.' "
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Rev 21:6-8
7 "He who overcomes shall inherit these things, and I will be his God and he will be My son. 8 "But for the cowardly and unbelieving and abominable and murderers and immoral persons and sorcerers and idolaters and all liars, their part will be in the lake that burns with fire and brimstone, which is the second death."
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The Bible does not teach OSAS; the Bible teaches that those who overcome the flesh and persevere until the end will enter God's rest.