Musnad Ahmad 1060:24

Qutaybah ibn Sa'id narrated to us, 'Abdullah ibn Lahi'ah narrated to us, from Yazid ibn Abi Habib, from Aslam Abu 'Imran, from Abu Ayyub al-Ansari, who said: I heard the Messenger of Allah, peace and blessings of Allah be upon him, saying: "Hasten to the Maghrib prayer before the rising of the star."