During the festival we read several sections of the Tanach (acronym for Torah, Nevi'im [Prophets] and K'tuvim [Writings]). They mention Pesach and its Halachic details, its history and the description of its celebration at a particular time. There are three exceptions: The Haftarot on the last two days of Yom Tov, and Shir HaShirim (The Song of Songs). The Haftara of the seventh day presents David's song of thanksgiving after he was saved from King Saul. This parallels the Torah reading for that day, which is the singing of the Jewish People after crossing the sea.
The Haftara for the eighth day presents a description of the Messianic redemption which the Sages said will start in Nisan, just as the redemption from Egypt began in Nisan. Shir HaShirim, read on Shabbat Chol HaMoed, alludes to our liberation from Egypt, and stresses the deep bond that was created at Sinai between the Jewish People and God. This theme is expressed by a metaphor of a beautiful relationship between a man and a woman.