Hadith ~ Intentions

The Amir al-Mu'minin, Abu Hafs 'Umar ibn al-Khattab said, "I heard the Messenger of Allah, may Allah bless him and grant him peace, say, 'Actions only go by intentions. Everyone gets what they intend. Anyone, therefore, who emigrates to Allah and His Messenger, his emigration is indeed to Allah and His Messenger. But anyone who emigrates to gain something of this world or to marry a woman, his emigration is to that to which he emigrated.'" [Agreed to be sound]

Riyad as-Salihin (The Meadows of the Righteous) of Iman Mohieddine Annawawi 631-676.  Chapter 1: "on Sincerity and having an intention for all actions, words and states, outward and inward", Hadith Number: 1.