It is narrated from Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Heedlessness is in three things: heedlessness of the remembrance of Allah, the Mighty and Majestic; from praying the morning prayer until the sun rises; and a man's heedlessness of himself in the matter of debt until it overwhelms him."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13718
It is narrated from Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Knowledge is three things, and whatever is beside them is extra: a decisive verse, an established Sunnah, and a just obligation."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13719