An additional cup is filled and set aside for the prophet Elijah (Eliyahu). Tradition says that Elijah, who will precede the arrival of the Messiah, makes an appearance at every Seder. We traditionally open a door to the home to allow Elijah to enter and sing the song Eliyahu Hanavi:
Eliyahu Hanavi, Eliyahu Hatishbi, Eliyahu, Eliyahu, Eliyahu Hagiladi
Bimheirah beyameinu Yavo Eileinu
Im Mashiach Ben David Im Mashiach Ben David
Eliyahu Hanavi, Eliyahu Hatishbi,
Eliyahu, Eliyahu, Eliyahu Hagiladi.
Elijah the Prophet, Elijah the Tishbite, Elijah the Giladite, may he come speedily to us in our days along with Messiah the son of David.
The blessing over the fourth cup of wine is recited:
Barukh atah Adonai Eloheynu melekh ha-olam Boreh P’ree Ha-ga-fen.
Blessed are You, Lord our God, King of the Universe, who creates the fruit of the vine.
The fourth cup of wine is drunk