Reference for Pesachim 15:18
וכה"ג לאו מצוה הוא והתניא האומר סלע זו לצדקה בשביל שיחיה בני או שאהיה בן העוה"ב
A Tanna taught: We do not oblige him to insert his hand into holes and chinks and search [there], on account of the danger. Which danger? Shall we say. the danger of a snake, - then when he used it, how could he use it? - This arises only where it [the wall] collapsed.<span class="x" onmousemove="('comment',' Snakes are often found among debris, hence only the top of the ruins must be searched, but one need not investigate below the surface.');"><sup>29</sup></span> But if it collapsed, why do I need searching [at all]? Surely we learned: If ruins collapsed on leaven, it is regarded as removed? - There [the circumstances are] that a dog cannot search it out; here, that a dog can search it out. But R'Eleazar said: Those sent [to perform] a religious duty do not suffer harm? - Said R'Ashi: He may have lost a needle and come to look for it.<span class="x" onmousemove="('comment',' While searching for the leaven. He is, not being exclusively engaged on a religious task, exposed to danger.');"><sup>30</sup></span> But is it not [regarded as the fulfilment of] a religious duty in such a case? Surely it was taught: If one declares, 'This sela'<span class="x" onmousemove="('comment',' A coin.');"><sup>31</sup></span> be for charity in order that my son may live,' or, 'that I may merit t future world,'<span class="x" onmousemove="('comment',' Lit., 'that I may be a son of the future world'. On the 'future world' v. Sanh., Sonc. ed. p. 601, n. 3.');"><sup>32</sup></span>
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