Reference for Kiddushin 141:9

תאנא עוד אחרת היתה ולא רצו חכמים לגלותה אבל חכמים מוסרים אותו לבניהם ולתלמידיהן פעם אחת בשבוע ואמרי לה פעמים בשבוע אמר רב נחמן בר יצחק מסתברא כמאן דאמר פעם אחת בשבוע כדתניא הריני נזיר אם לא אגלה משפחות יהיה נזיר ולא יגלה משפחות

if I do not reveal the families [which are impure],' he must be a nazir, and not reveal the families.<span class="x" onmousemove="('comment',' This shews how inadvisable and dangerous such action might be; hence once a septennate would have been enough.');">²¹</span> Rabbah B'Bar Hanah said in R'Johanan's name: The [pronunciation of the Divine] Name of four letters the Sages confide to their disciples once a septennate - others state, twice a septennate. Said R'Nahman B'Isaac: Reason supports the view that it was once a septennate, for it is written, this is my name for ever [le'olam]<span class="x" onmousemove="('comment',' Ex. III, 15.');">²²</span> which is written le'allem.<span class="x" onmousemove="('comment',' Defectively without a waw, hence to be read le'allem, To be kept secret.');">²³</span>

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