Actually there is a Parable in the Scriptures that strongly refutes OSAS. The Parable of the Wedding Banquet (
Matthew 22:1-14) The Gentile believer who did not have on a wedding garment was bound hand and foot and was cast into outer darkness. Why? Well, because the garment represents the righteousness of the saints. How so?
Revelation 19:8 says,
And to her was granted that she should be arrayed in fine linen, clean and white: for the fine linen is the righteousness of saints.
Side Note:
We know it is a Gentile believer (Who had on a wedding garment) because in the parable, the first group was specifically invited (who then was killed by the king's servants); And the second group that was invited was a general call to all who were in the highways both bad and good. So the first group was Israel and the second group was the Gentiles. Remember, we are not to pull out the weeds among the wheat until the harvest comes time to reap. Remember, the Son of man is going to send forth his angels and gather all those who offend and work iniquity and cast them out of his Kingdom.