Talmud Torah

[והעמידו תלמידים הרבה] שב״ש אומרים אל ישנה אדם אלא למי שהוא חכם ועניו ובן אבות ועשיר וב״ה אומרים לכל אדם ישנה שהרבה פושעים היו בהם בישראל ונתקרבו לתלמוד תורה ויצאו מהם צדיקים חסידים וכשרים:

Avot DeRabbi Natan 2:9

[And raise up many students.] For the House of Shammai, say: One should teach only a person who is wise, humble, of good pedigree, and rich. But the House of Hillel say: Teach everyone, for there were many sinners in Israel, and they were brought close to Torah study, and they came out righteous, kind, and proper.

שבת ל״א א

שׁוּב מַעֲשֶׂה בְּגוֹי אֶחָד שֶׁבָּא לִפְנֵי שַׁמַּאי. אָמַר לוֹ: גַּיְּירֵנִי עַל מְנָת שֶׁתְּלַמְּדֵנִי כׇּל הַתּוֹרָה כּוּלָּהּ כְּשֶׁאֲנִי עוֹמֵד עַל רֶגֶל אַחַת! דְּחָפוֹ בְּאַמַּת הַבִּנְיָן שֶׁבְּיָדוֹ. בָּא לִפְנֵי הִלֵּל, גַּיְירֵיהּ. אָמַר לוֹ: דַּעֲלָךְ סְנֵי לְחַבְרָךְ לָא תַּעֲבֵיד — זוֹ הִיא כׇּל הַתּוֹרָה כּוּלָּהּ, וְאִידַּךְ פֵּירוּשַׁהּ הוּא, זִיל גְּמוֹר.

Shabbat 31a

There was another incident involving one gentile who came before Shammai and said to Shammai: Convert me on condition that you teach me the entire Torah while I am standing on one foot. Shammai pushed him away with the builder’s cubit in his hand. This was a common measuring stick and Shammai was a builder by trade. The same gentile came before Hillel. He converted him and said to him: That which is hateful to you do not do to another; that is the entire Torah, and the rest is its interpretation. Go study.

משנה אבות א׳:י״ג

(יג) הוּא הָיָה אוֹמֵר, נָגֵד שְׁמָא, אָבֵד שְׁמֵהּ. וּדְלֹא מוֹסִיף, יָסֵף. וּדְלֹא יָלֵיף, קְטָלָא חַיָּב. וּדְאִשְׁתַּמֵּשׁ בְּתָגָא, חָלֵף:

Pirkei Avot 1:13

(13) He [also] used to say: one who makes his name great causes his name to be destroyed; one who does not add [to his knowledge] causes [it] to cease; one who does not study [the Torah] deserves death; one who makes [unworthy] use of the crown [of learning] shall pass away.