Leviticus 24:2
צַו אֶת בְּנֵי יִשְׂרָאֵל וְיִקְחוּ אֵלֶיךָ שֶׁמֶן זַיִת זָךְ כָּתִית לַמָּאוֹר לְהַעֲלֹת נֵר תָּמִיד
Command the children of Israel to bring to you pure pressed olive oil for the light, to cause a light to burn continuously.
In parshas Emor, the commandment of lighting the Menorah in the Mishkan (Tabernacle) immediately follows the Torah's description of the holiday of Succos. This proximity of topics alludes to Chanukah - the holiday involving the Menorah that would later follow Succos in the Jewish calendar. The Rokeiach (R. Eleazar of Worms, d.1238) sees something additional in this juxtaposition. Just as Succos (including Shemini Atzeres) is an eight-day festival, he tells us, so is Chanukah intended to be an eight-day holiday.