Reference for Bava Kamma 101:1

לא משום דלית ביה הבלא אי הכי הוזק בו חייב הא לית ביה הבלא אמר ליה אין הבל למיתה ויש הבל לנזקין

No; it is because there was no unhealthy air there. But if so, why where it was injured in such a pit would there be liability since there was no unhealthy air there? — He replied: There was not unhealthy air there sufficient to kill, but there was unhealthy air there enough to injure.

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