Majma al-Zawaid 11490 — Surah al-Fajr, and the words of Allah

Sayyiduna Jabir (may Allah be pleased with him) reported from the Prophet (peace and blessings be upon him) concerning this saying of Allah Almighty, Allah Almighty says: "And by the ten nights." The Prophet (peace and blessings be upon him) said: "This means the first ten days of Dhu al-Hijjah." "And by the even and the odd." The Prophet (peace and blessings be upon him) said: "The even means the day of Eid al-Adha, and the odd means the Day of Arafah."
Al-Bazzar and Ahmad recorded it, and the narrators of both are the narrators of the Sahih, except Ayyash bin Uqbah, and he is thiqah (trustworthy).