For the source text click/tap here: Nedarim 17
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Can we make two oaths, shavuot, at the same time? Can we make two vows, nedarim, at the same time?
The rabbis agree that two oaths cannot be made concurrently. However, vows seem to be more complicated. In the case of nazirut, vowing to become a nazirite, the rabbis suggest that two such vows might extend the nazirite's commitment. The minimum time to be a nazirite is 30 days. If a person makes this vow twice, s/he has promised at least two 30-day stints as a nazirite.
We examine the performative speech act in Jewish law as well as Jacob Mann’s monograph of oaths in the synoptic gospels and its attack on the pharisaic way of making vows.