The Prophet ﷺ said, "The truest poetic verse ever said by a poet, is: Indeed! Everything except Allah, is perishable."  

عَنِ النَّبِيِّ ﷺ قَالَ أَصْدَقُ بَيْتٍ قَالَهُ الشَّاعِرُ أَلاَ كُلُّ شَىْءٍ مَا خَلاَ اللَّهَ بَاطِلُ  

The truest couplet recited by a poet is: "Behold! apart from Allah everything is vain," and he made no addition to it.  

عَنِ النَّبِيِّ ﷺ قَالَ أَصْدَقُ بَيْتٍ قَالَتْهُ الشُّعَرَاءُ أَلاَ كُلُّ شَىْءٍ مَا خَلاَ اللَّهَ بَاطِلٌ  

The truest couplet recited by a poet is: "Behold! apart from Allah everything is vain," and he made no addition to it. (Using translation from Muslim 2256d)   

عَنِ النَّبِيِّ ﷺ أَنَّهُ قَالَ إِنَّ أَصْدَقَ بَيْتٍ قَالَتْهُ الشُّعَرَاءُ[البحر الطويل]أَلَا كُلُّ شَيْءٍ مَا خَلَا اللهَ بَاطِلُ  

[Machine] He said, Messenger of Allah ﷺ , said, "The most truthful saying said by the Arabs is: Behold! Everything other than Allah is false." This hadith was reported in Sahih from the narration of Ghandar from Shu'bah.  

أَنَّهُ قَالَ قَالَ رَسُولُ اللهِ ﷺ أَصْدَقُ بَيْتٍ قَالَتْهُ الْعَرَبُ أَلَا كُلُّ شَيْءٍ مَا خَلَا اللهَ بَاطِلٌ أَخْرَجَاهُ فِي الصَّحِيحِ مِنْ حَدِيثِ غُنْدَرٍ عَنْ شُعْبَةَ