And you shall rejoice in your festival, you and your son and your daughter and your manservant and your maidservant and the Levi and the stranger and the orphan and the widow who are within your gates.
English: "And you shall rejoice in your festival" — Rav Daniel bar Rav Ketina said in the name of Rav: From where do we know that one may not marry a wife on the festival? From the verse "and you shall rejoice in your festival"—and not in your wife.
On the daf / in context: Marriage would introduce a competing joy that detracts from the joy of the festival itself.
Type of Learning
Derash on the verse (Moed Katan) — one may not marry on the festival.
What Is Learned
It is forbidden to marry a wife during the festival, so that the joy of the festival not be mixed with the joy of a new marriage.