Musnad Abu Ya'la al-Mawsili 6:119

Zuhayr narrated to us, Mu'awiyah ibn 'Amr narrated to us, Za'idah narrated to us, from Isma'il ibn Abi Khalid, from Muhammad ibn Sa'd, from his father, from the Prophet (peace and blessings of Allah be upon him), who said: "The month is like this, and like this, and like this—ten, and ten, and nine—one time."