Related к Псахи́м 1:13

On the evening of the fourteenth, we check for chamets by candlelight, not by sunlight, not by moonlight, but rather only by candlelight (since the candlelight is greater). Even though there's no explicit proof for this, it's a remembrance for that which is discussed (Tzefaniah 1) "And in that time I will look through Jerusalem by candle" and that which it says (Proverbs 20) "The candle of God is a human soul".

Bet Shamai say: "Two rows on the entire cellar -- the outer row which faces the door, and the uppermost which faces the ceiling. [but the lower rows and the inner rows don't need checking]." Bet Hillel say: "[The outer row is] the uppermost which faces the door and those under it. However the rows that are more inwards from it don't need checking".