It is recommended for the Muslim to fast six days of Shawwaal, and in this there is great virtue and an immense reward. Whoever fasts these six days will have recorded for him a reward as if he had fasted a whole year, as was reported in a saheeh hadeeth from the Prophet (peace and blessings of Allaah be upon him).
"The reward of deeds depends upon the intentions and every person will get the reward according to what he has intended. So whoever emigrates to Allah and His Messenger, then his emigration is to Allaah and His Messenger. And whoever emigrates for worldly benefits or for a woman to marry, his emigration was for what he emigrated for." [Saheeh Al-Bukhari]