English: I have only days — from where [do we know] nights? Scripture says: “In the first month, on the fourteenth day of the month at evening, you shall eat matzos, until the twenty-first day of the month at evening.”
Type of Learning
Expansion from “days” to nights via the evening-to-evening span of 12:18.
What Is Learned
Matzah is eaten nights as well as days throughout the seven-day period.