Sahih Bukhari Volume 001, Book 001, Hadith Number 001.

Narrated By ‘Umar bin Al-Khattab: I heard Allah’s Apostle صلى الله عليه وآله وسلم‎ saying, “The reward of deeds depends upon the intentions and every person will get the reward according to what he has intended. So whoever emigrated for worldly benefits or for a woman to marry, his emigration was for what he emigrated for.”