‏الشعر : Hadeeth No:5607 Abu Huraira reported Allaah's Prophet (sallAllaahu alayhi wa sallam) as saying: The truest couplet recited by a poet is:" Behold! apart from Allaah everything is vain," and he made no addition to it....

‏الزهد والرقائق‏ : Hadeeth No:7117 Sufyan reported this hadith with the same chain of transmitters and he made this addition:" I did not hear anyone saying besides him that it was Allaah's Messenger (sallAllaahu alayhi wa sallam) who had said so."...