Halakhah su Salmi 50:5

Yam shel Shlomoh, Beizah 2:5, develops the thesis that every joyous repast requires meat but that, subsequent to the destruction of the Temple, there is an additional requirement to drink wine in order to dispel melancholy. Magen Avraham, Oraḥ Hayyim 249:6, cites Maharam of Lublin who maintains that the "mizvah of rejoicing [on the occasion] of a circumcision cannot be fulfilled with dairy dishes."²¹Cf., however, Magen Avraham 151:5, who, in a different context, remarks that the requirement of a se‘udat miẓvah can be fulfilled with “bread and legumes.” R. Jacob Emden, Migdal Oz, naḥal 9, sec. 17:3, declares that both meat and wine must be served at a se'udat mizvah.²²Tosafot Ḥadashim, Sanhedrin 8:2, also indicate that a se‘udat miẓvah requires both meat and wine. Migdal Oz comments that a banquet is termed a "mishteh," as in Genesis 21:8, because of the drink that is served. He assumes that the noun "mishteh" is derived from the verb "shatoh," meaning "to drink." Migdal Oz finds an allusion to partaking of meat in particular at a circumcision repast in Psalms 50:5 which he renders as "those who enter into a covenant with Me by slaughter."