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Who knows sixty-seven?

Please cite/link your sources, if possible. At some point in the next few days, I will:

  • Upvote all interesting answers.

  • Accept the best answer.

  • Go on to the next number.

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up vote 3 down vote accepted

A Nazir who was a confirmed Metzora (muchlat), but possibly tamei, cannot resume drinking wine and becoming tamei until at least 67 days have passed (Nazir 60b). See the commentators there for the details.

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Commentators where? – Isaac Moses Jul 28 '10 at 17:25
Whoops, forgot the reference. Thanks. – Dave Jul 28 '10 at 17:27

According to the Rambam (Hil. Sefer Torah ch. 8), the Song of Haazinu should be written in 67 lines in a Sefer Torah.

(I believe that the Yemenite communities still do so; most other traditions have 70 instead. But I have a feeling we'll have a lot more "70 mi yodeya"s than 67s...)

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The Gemara in Bechoros 8a states that a carob tree takes 70 years from the time it is planted until its fruits develop, and the "gestation period" of the fruit (i.e., the span between when the flowers emerge and when the fruit develop -- Rashi) is three years. Hence, it takes 67 years for a carob tree to flower.

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A muzuzah's position is at the beginning of the top third of the doorway -- 67% (rounded) of the doorway's height, as measured from the floor.

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Is it sephardim who say 3/4 instead? – Shalom Jul 28 '10 at 18:49
And if we're going with 67%, we hold bitul b'rov is just that, majority means 50.1% vs. 40.9%; but who is it that held you literally needed "chad b'trei", 67% to 33%? – Shalom Jul 28 '10 at 18:50
Assuming 2/3 is the rule, hundredths is too many significant figures to justify 67-ness in this case. – Isaac Moses Jul 29 '10 at 17:37

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