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