What does אור mean?

• Rav Huna – morning/daytime
• Rav Yehudah – twilight/nighttime

Seven challenges based on Pesukim (Metive)

• 3 proofs for daytime – Yosef, David, Creation
• 1 proof for nighttime – Tehillim 148
• 3 proofs for daytime – Iyov 24, Iyov 3, Tehillm 139

Seven proofs based on Tannaitic sources (Ta Shema in Yemenite ms.)

• 3 proofs for nighttime – Mishnah Pesahim 1:3, working on 14th, torches
• 1 proof for daytime – Kohen up all night
• 3 proofs for nighttime – Mar Zutra (Metive), Notar, Yom Kippur Arbit

1 Last proof from a Baraita parallel to Mishnah 1:1 – לילי instead of אור