Mishnah for Sukkah 52:2
אמר רב אסור לאדם לישן ביום יותר משינת הסוס וכמה שינת הסוס שיתין נשמי
Rav said, It is forbidden to sleep by day more than the sleep of a horse. And what is the sleep of a horse? Sixty breaths.
Pirkei Avot
He [Rabbi Tarfon] used to say: It is not your duty to finish the work, but neither are you at liberty to neglect it; If you have studied much Torah, you shall be given much reward. Faithful is your employer to pay you the reward of your labor; And know that the grant of reward unto the righteous is in the age to come.
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