Who knows one hundred fifty-one?
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On 8 Adar the Jews of Barbados were granted permission to take an oath on the Old Testament, 1674. This was a first for the New World. 151 years later, also on 8 Adar, Jews of Maryland were allowed to take a non-Christian oath. A declaration of belief in Reward and Punishment in the World to Come was part of their oath.
According to various Kabbalistic sources going back to the Arizal, one who becomes angry should fast 151 fasts in atonement (this being the gematria of כעס plus one for the overall word (כולל)). This number is also associated with the root קנא, "to be jealous," as in the description of Pinchas' zealousness for G-d's honor during the affair at Shittim.