Haamek Davar on Numbers 8:2:3העמק דבר על במדבר ח׳:ב׳:ג׳
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Haamek Davar on Exodus 37:19:1העמק דבר על שמות ל״ז:י״ט:א׳
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Bekhorot 8a:15בכורות ח׳ א:ט״ו
The Gemara asks: From where is this matter, that the gestation period of a snake is seven years, derived? Rav Yehuda says that Rav says, and some determined it to be in the name of Rabbi Yehoshua ben Ḥananya: It is derived from that which is stated with regard to the punishment of the snake for causing Adam and Eve to sin: “Cursed are you from among all animals, and from among all beasts of the field” (Genesis 3:14), in that your gestation period should be longer than all of them. Now, why does the verse mention the beasts of the field, i.e., undomesticated animals? If the snake was cursed more than the domesticated animals, then all the more so is it not clear that it was cursed more than the undomesticated animals? The shortest gestation period of domesticated animals, which is five months for a goat, is longer than the shortest gestation period among undomesticated animals, which is fifty-two days for a cat.
Haamek Davar on Numbers 8:6:2העמק דבר על במדבר ח׳:ו׳:ב׳
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Harchev Davar on Numbers 8:34הרחב דבר על במדבר ח׳:ל״ד
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Haamek Davar on Numbers 8:15:1העמק דבר על במדבר ח׳:ט״ו:א׳
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Haamek Davar on Numbers 8:15:2העמק דבר על במדבר ח׳:ט״ו:ב׳
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Harchev Davar on Numbers 8:35הרחב דבר על במדבר ח׳:ל״ה
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