תלמוד על מועד קטן 1:1

There¹⁴²Mishnah Mo‘ed Qaṭan 1:7., we have stated: “One does not marry women on a holiday¹⁴³The intermediate days of the Passover and Tabernacles holidays when acquisitions are permitted and in biblical law the man could acquire a wife and the woman the ketubah rights..” Simeon bar Abba in the name of Rebbi Joḥanan: Because of refraining from being fruitful and increase¹⁴⁴The prohibition to organize weddings on the intermediate days of a holiday is purely rabbinical, so that people should not refrain from marrying during the rest of the year in order to save money.
In Mo‘ed Qaṭan 1:7 1. 26ff. and the Babli, 8b/9a, the reason for the prohibition is a matter of disagreement among several authors.. They asked before Rebbi Yose: May a slave marry a woman on a holiday¹⁴⁵The question is difficult to understand since the slave cannot marry as long as he is a slave but is a full Jew subject to all Jewish laws the moment he is manumitted. Maybe the question is about a slave manumitted on the holiday.? He told them, let us hear from the following: “Shall he be alone? But the world was created only for procreation and increase!” And Rebbi Simeon bar Abba said in the name of Rebbi Joḥanan: Anybody commanded to be fruitful and increase is forbidden to marry on a holiday¹⁴⁶Even if in this case the marriage has to be postponed for a few days. A slightly different version of this paragraph is in Mo‘ed Qaṭan 1:7 80d l. 30, quoted by Tosaphot Ḥagiga 2b, Giṭṭin 41b, s. v. לא. Tosaphot point out that in a certain sense a male slave cannot fulfill the commandment to be fruitful because he cannot have any family relationship with his biological children..