Abu Hurairah (Ra) narrates that Rasúlullãh (saw) said: The Mufarridún have gone ahead! Sahãbah asked: Who are the Mufarridún, O Rasúlullãh? He replied: Those who are devoted intensively to the remembrance of Allãh. Allãh's remembrance reduces their burdens. Hence, they will come with a little burden on the Day of Resurrection.

(Tirmidhí)