They mix him the first cup beit shama says he first bleses the day then over the wine but beit hililel says you bless over the wine and then over the day

GEMARA: The Sages taught: These are the matters of dispute between Beit Shammai and Beit Hillel with regard to the laws of a meal. Beit Shammai say: When reciting kiddush over wine, one recites a blessing over the specialness of the day and then recites a blessing over the wine, because the day causes the wine to come. And Beit Shammai offer an additional reason. The day has already been sanctified and the wine has not yet come. And Beit Hillel say: One recites the blessing over the wine and then recites a blessing over the day, because the wine causes kiddush to be recited. Since one does not recite kiddush without wine or bread, clearly the wine is the primary feature of the ritual. Alternatively, the blessing over wine is recited often and the blessing over the day is not recited as often, and there is a general rule: When a common practice and a less common practice coincide, the more common practice takes precedence over the less common practice. The Gemara finishes: And the law follows the opinion of Beit Hillel.