Refill the fourth cup of wine and open the front door to invite the prophet Elijah to join our seder.

אֵלִיָהוּ הַנָבִיא, אֵלִיָהוּ הַתִּשְׁבִּי, אֵלִיָהוּ הַגִלְעָדִי בִּמְהֵרָה יָבוֹא אֵלֵינוּ עִם מָשִׁיחַ בֶּן דָוִד

Eliyahu Ha-Navee, Eliyahu Ha-Tish-bee, Elyahu Ha-Giladi, Bimherah Yavo Ei-leinu, Eem Mashiach ben David.

Elijah the Prophet, Elijah the Tishbite, Elijah the Giladite, May he soon come to us, with Mashiach the son of David.

At the same time, we fill an additional cup and set it aside for the prophet Eliyahu (Elijah). This practice came about because their was a difference of opinion among the sages, as to whether there should be four or five cups at the seder. The compromise was to drink four, and leave a fifth—tradition says that Eliyahu will return at the seder prior to the coming of Messiah, and he will tell us whether to drink of the fifth cup.

haggadah Section: Tzafun