נֵ֣ר יְ֭הוָה נִשְׁמַ֣ת אָדָ֑ם חֹ֝פֵ֗שׂ כָּל־חַדְרֵי־בָֽטֶן׃
사람의 영혼은 여호와의 등불이라 사람의 깊은 속을 살피느니라
Mishnah Pesachim
On the evening of the fourteenth [of Nissan] they search they house for chametz by the light of a lamp. Every place into which chametz is not brought does not require searching, So why did they rule: two rows of the wine cellar [must be searched]? [This is actually] a place into which chametz might be taken. Bet Shammai say: two rows over the front of the whole cellar; But Bet Hillel say: the two outer rows, which are the uppermost.