The truest verse recited by a poet is: "Behold! apart from Allah everything is vain," and Ibn Abu Salt was almost a Muslim.

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ أَصْدَقُ بَيْتٍ قَالَهُ الشَّاعِرُ أَلاَ كُلُّ شَىْءٍ مَا خَلاَ اللَّهَ بَاطِلٌ وَكَادَ ابْنُ أَبِي الصَّلْتِ أَنْ يُسْلِمَ

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

I heard Messenger of Allah ﷺ as saying: The truest word which the poet stated is the word of Labid: "Behold! apart from Allah everything is vain."

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ إِنَّ أَصْدَقَ كَلِمَةٍ قَالَهَا شَاعِرٌ كَلِمَةُ لَبِيدٍ أَلاَ كُلُّ شَىْءٍ مَا خَلاَ اللَّهَ بَاطِلٌ مَا زَادَ عَلَى ذَلِكَ

[Machine] "From the Prophet ﷺ , the most truthful statement said by the poet [Al-Bahr Al-Taweel]: Indeed, everything except Allah is void, and the son of Abu Salat was about to surrender."

عَنِ النَّبِيِّ ﷺ أَصْدَقُ بَيْتٍ قَالَهُ الشَّاعِرُ[البحر الطويل]أَلَا كُلُّ شَيْءٍ مَا خَلَا اللهَ بَاطِلُوَكَادَ ابْنُ أَبِي الصَّلْتِ يُسْلِمُ

"The truest of wods spoken by the poet are the words of Labid: Everything except Allah is false.' And Abu Umayyah bin Abu Salt nearly accepted Islam." (Using translation from Ibn Mājah 3757)

عَنِ النَّبِيِّ ﷺ قَالَ أَصْدَقُ كَلِمَةٍ قَالَهَا الشَّاعِرُ[البحر الطويل]أَلَا كُلُّ شَيْءٍ مَا خَلَا اللهَ بَاطِلُوَكَادَ أُمَيَّةُ بْنُ أَبِي الصَّلْتِ أَنْ يُسْلِمَ

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

"إِنَّ من الشعر حكمةً، وأَصدقُ بيت قالته العرب: أَلا كلُّ شئٍ ما خلا اللَّه باطلٌ ".