Narrated 'Umar bin Al-Khattab: I heard Allah's Messenger 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.
Is there an authentic hadith, as to the story behind who the Messenger of Allah (peace be upon him) refers to when he mentions someone migrating for a woman? (To my limited knowledge, the man migrated—or, rather, his primary motivation was—because the woman he wanted to marry wanted him to come to Madine.)