You’ve been victimized by churchianity.
Paul’s mystery was how the rejected bride was to be remarried without violating Torah. This is discussed in chapter 7 of the epistle to the Roman Hebrews.
The question has its roots in the book of Hosea, where it is told of the divorce, and then subsequent remarriage of the House of Israel (’Ephraim’).
Torah scholars were all aware that such was a violation of Torah, and thus thought it impossible.
The solution to the mystery lie in the death of the husband, allowing the bride to be remarried legally. Yeshua died to remarry his bride.
Churchians do not study Torah; they’ve been blinded by their own reluctance to obeying Yehova’s commandments, so they are unable to understand this ‘mystery.’
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You my friend have been duped by Hebrew roots. You cannot mix law and grace. By the way Paul has given us many commandments that came straight from the mouth of the Word.
You act like we don’t have laws let alone have them written on our hearts (awesome huh? )
The OT says God will one day write the laws on the hearts of all Israel and they will no longer have to teach them to their children. Seven years plus a little bit and Israel gets the earthly kingdom they have been waiting for.