Good Manners and Form (Al-Adab)
Ṣaḥīḥ al-Bukhārī 6147
أَصْدَقُ كَلِمَةٍ قَالَهَا الشَّاعِرُ كَلِمَةُ لَبِيدٍ أَلاَ كُلُّ شَىْءٍ مَا خَلاَ اللَّهَ بَاطِلُ
aṣdaqu kalimatin qālahā ash-shāʿiru kalimah labīdin alā kullu shayʾin mā khalā-Llāh bāṭilu
Transliteration generated from the Arabic vowel marks
The full narration
Narrated Abu Huraira:The Prophet (ﷺ) said, "The most true words said by a poet were the words of Labid. He said, i.e. 'Verily, everything except Allah is perishable and Umaiya bin Abi As-Salt was about to embrace Islam
Source
Ṣaḥīḥ al-Bukhārī · 6147
Ṣaḥīḥ