Abu Shaykh al-Huna'i said: A man from the tribe of Abd al-Qays called Iyad told me that he heard the Prophet (peace and blessings be upon him) say: "Hold fast to the remembrance of your Lord, and offer your prayer at the beginning of its time, for Allah, the Mighty and Majestic, multiplies its reward for you."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 15083