Musannaf Ibn Abi Shayba 36:120

Affan narrated to us, he said: Khalid bin Abdullah narrated to us, he said: Amr bin Yahya informed us, from Amir bin Abdullah bin al-Zubayr, from his father, from Amir bin Rabi'ah al-Badri, he said: Badr was on Monday, the seventeenth of Ramadan.