Paul is warning against rejecting the Graces of God... but please note, Paul did not teach Jews to forsake the law, such was the libel of his opponents. The Jewish Christians did not come (back) to Sinai because they had already been there... Paul didn't say leave Sinai behind...
he's just saying that the present circumstances are even more serious than those in the days of Moses, I'm not sure
Hebrews 12 implies quite as much as you suggest
What does the text below say about the Sinai Covenant?
Does Paul compare the Sinai Covenant to slavery?
Gal 4:24 Which things are an allegory: for these are
the two covenants; the one from the mount Sinai, which gendereth to bondage, which is Agar.
Gal 4:25 For this Agar is mount Sinai in Arabia, and answereth to Jerusalem which now is, and is in bondage with her children.
Gal 4:26 But Jerusalem which is above is free, which is the mother of us all.
Gal 4:27 For it is written, Rejoice, thou barren that bearest not; break forth and cry, thou that travailest not: for the desolate hath many more children than she which hath an husband.
Gal 4:28 Now we, brethren, as Isaac was, are the children of promise.
Gal 4:29 But as then he that was born after the flesh persecuted him that was born after the Spirit, even so it is now.
Gal 4:30 Nevertheless what saith the scripture?
Cast out the bondwoman and her son: for the son of the bondwoman shall not be heir with the son of the freewoman.
Gal 4:31
So then, brethren, we are not children of the bondwoman, but of the free.
Heb 12:18
For ye are not come unto the mount that might be touched, and that burned with fire, nor unto blackness, and darkness, and tempest,
(Is the author referring to Mount Sinai in the verse above?)
Heb 12:19 And the sound of a trumpet, and the voice of words; which voice they that heard intreated that the word should not be spoken to them any more:
Heb 12:20 (For they could not endure that which was commanded, And if so much as a beast touch the mountain, it shall be stoned, or thrust through with a dart:
Heb 12:21 And so terrible was the sight, that Moses said, I exceedingly fear and quake.
Heb 12:22
But ye are come unto mount Sion, and unto the city of the living God, the heavenly Jerusalem, and to an innumerable company of angels,
Heb 12:23
To the general assembly and church of the firstborn, which are written in heaven, and to God the Judge of all, and to the spirits of just men made perfect,
Heb 12:24
And to Jesus the mediator of the new covenant, and to the blood of sprinkling, that speaketh better things than that of Abel.
Is the author contrasting the Sinai Covenant to the New Covenant in the passage above?
Some of us have not let go of the bondwoman, at this point in time.
You cannot fully embrace the New Covenant, until you let go of the old.
The New Covenant: Bob George
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