Reference for Sanhedrin 153:4

ואמר רבא כפתו לפני ארי פטור לפני יתושין חייב רב אשי אמר אפילו לפני יתושין נמי פטור הני אזלי והני אתו

rule him not liable? — Because of the verse, [Or in enmity he smite him with his hand, that he die:] He that smote him shall surely be put to death: for he is a murderer:<span class="x" onmousemove="('comment',' Ibid. The first half of the verse extends the law to confining one's neighbour in a place of death, (p. 519). ');">³</span>

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