Reference for Kiddushin 4:13

לֹא יִלְמַד אָדָם רַוָּק סוֹפְרִים, וְלֹא תִלְמַד אִשָּׁה סוֹפְרִים. רַבִּי אֱלִיעֶזֶר אוֹמֵר, אַף מִי שֶׁאֵין לוֹ אִשָּׁה, לֹא יִלְמַד סוֹפְרִים:

A bachelor should not accustom himself to teaching young children, [for their mothers bring them to him to school ], nor should a woman do so. R. Eliezer says: Also one who does not have a wife. [Even if he is not single, but has a wife who is not with him, he should not accustom himself to teach young children. The halachah is not in accordance with R. Eliezer. ]

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