Abu Dawud
General Behavior
Book Number: 036 / Hadith Number: 5055
Narated By Abdullah ibn Ghannam : The Prophet (pbuh) said: If anyone says in the morning: "O Allah! whatever favour has come to me, it comes from Thee alone Who has no partner; to Thee praise is due and thanksgiving,'! he will have expressed full thanksgiving for the day; and if anyone says the same in the evening, he will have expressed full thanksgiving for the night.