Commentary for Kiddushin 141:13

אמר רב יהודה אמר רב שם בן ארבעים ושתים אותיות אין מוסרין אותו אלא למי שצנוע ועניו ועומד בחצי ימיו ואינו כועס ואינו משתכר ואינו מעמיד על מדותיו וכל היודעו והזהיר בו והמשמרו בטהרה אהוב למעלה ונחמד למטה ואימתו מוטלת על הבריות ונוחל שני עולמים העולם הזה והעולם הבא

Rab Judah said in Rab's name: The forty-two lettered Name<span class="x" onmousemove="('comment',' Maim. in 'Moreh' I, 62, conjectures that these multiliteral Names, of which no trace is found, were perhaps composed of several other divine names; also that not only the names were communicated, but their real meanings too. [On these names v. further Blau L. Das altjudische Zauberwesen pp. 137ff and Bacher. JE XI 264.] gubm');">³²</span> is entrusted only to him who is pious,<span class="x" onmousemove="('comment',' [ denotes simply a modest man careful to carry out his religious obligations, a pious man, and not a member of a particular sect - an Essene. v. Buchler Types, pp. 59ff.]');">³³</span> meek, middle-aged,<span class="x" onmousemove="('comment',' Lit., 'stands in the middle of his days'.');">³⁴</span> free from bad temper, sober,<span class="x" onmousemove="('comment',' Lit., 'he does not get angry, does not get drunk'.');">³⁵</span>

Daf Shevui to Kiddushin