וְהָיְתָ֣ה יָדִ֗י אֶֽל־הַנְּבִיאִ֞ים הַחֹזִ֣ים שָׁוְא֮ וְהַקֹּסְמִ֣ים כָּזָב֒ בְּס֧וֹד עַמִּ֣י לֹֽא־יִהְי֗וּ וּבִכְתָ֤ב בֵּֽית־יִשְׂרָאֵל֙ לֹ֣א יִכָּתֵ֔בוּ וְאֶל־אַדְמַ֥ת יִשְׂרָאֵ֖ל לֹ֣א יָבֹ֑אוּ וִידַעְתֶּ֕ם כִּ֥י אֲנִ֖י אֲדֹנָ֥י יְהוִֽה׃
And My hand shall be against the prophets that see vanity, and that divine lies; they shall not be in the council of My people, neither shall they be written in the register of the house of Israel, neither shall they enter into the land of Israel; and ye shall know that I am the Lord GOD.
Shenei Luchot HaBerit
The subject of the orbit of the moon, the fixing of leap-months and leap-years, is also related to aspects of the transmigration of souls. The appearance and disappearance of one generation after another reminds one of the lunar cycles. Our sages have jealously guarded what is called the סוד העיבור, the mechanics of how and under what conditions to declare these leap-years and leap-months. [cf. Ketuvot 112, based on Ezekiel 13,9. A collegium of seven scholars would deal with this issue in a closed session: normal sessions were open to the disciples Ed.]