Musnad Ahmad 788:135

'Affan narrated to us, Shu'bah narrated to us, from 'Amr ibn Murrah, from Abu 'Ubaydah, from Abu Musa, from the Prophet, peace and blessings of Allah be upon him, who said: "Indeed, Allah, the Almighty and Majestic, extends His hand by the day so that the sinner of the night may repent, and He extends His hand by the night so that the sinner of the day may repent, until the sun rises from its place of setting."