Midrash for Bava Kamma 182:3
אמר שמואל באשב בתענית
[implying that] just as to do good is permitted, so also to do evil [to oneself] is permitted; I have accordingly to apply [the same law in] the case where a man had sworn to do harm to himself and did not do harm?<span class="x" onmousemove="('comment',' Shebu. 27a. ');"><sup>3</sup></span>
Sifrei Devarim
(Devarim 20:20) "Only a tree that you know": This is a fruitful tree. (Ibid. 19) "to come before you into the siege": Cut it down.
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