Musnad Ahmad 28:162

Hassan narrated to us, Ibn Lahi'ah narrated to us, Huyayy ibn Abdullah narrated to me, that Abu Abd al-Rahman al-Hubuli narrated to him, from Abdullah ibn Amr ibn al-As, who said: The Messenger of Allah (peace and blessings of Allah be upon him) sent out a military expedition, and they gained spoils, and they returned quickly. The people talked about the proximity of their expedition, the abundance of their spoils, and the speed of their return. The Messenger of Allah (peace and blessings of Allah be upon him) said: "Shall I not guide you to that which is closer in expedition, more abundant in spoils, and swifter in return? Whoever performs ablution, then goes early to the mosque for the mid-morning prayer (Duha), he is closer in expedition, more abundant in spoils, and swifter in return."