Reference for Ketubot 99:10

אמר רב קטינא כל המכניס את בנו פחות מבן שש רץ אחריו ואינו מגיעו איכא דאמרי חביריו רצין אחריו ואין מגיעין אותו ותרוייהו איתנהו חליש וגמיר איבעית אימא הא דכחיש הא דבריא

Katina said: Whoever brings his son [to school] under the age of six will run after him but never overtake him. Others say: His fellows will run after him but will never overtake him. Both statements are correct: He is feeble but learned. If you want I might say: One applies to one who is weak; the latter, to one who is in good health.

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