"And there shall be no leavened bread seen in your possession, neither shall leaven be seen within all your property"—Exodus 13:7.
No chametz (leavened foods) may be seen in our possession for the duration of the holiday of Passover.
"Seven days there shall be no leaven found in your houses"—Exodus 12:19.
No chametz (leavened foods) may be in our possession on Passover, even if it is not visible, even if it belongs to another [Jew].
"In the evening [of the fifteenth of Nissan] you shall eat unleavened bread"—Exodus 12:18.
We are commanded to eat matzah, unleavened bread, on the eve of the fifteenth of Nissan, the first night of Passover.
