حَدَّثَنَا آدَمُ، حَدَّثَنَا اللَّيْثُ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ قَالَ حَرَّقَ رَسُولُ اللَّهِ صلى الله عليه وسلم نَخْلَ بَنِي النَّضِيرِ وَقَطَعَ وَهْىَ الْبُوَيْرَةُ فَنَزَلَتْ ‏ Begin hadith 0‏

Narrated Ibn `Umar: Allah's Messenger (PBUH) had the date-palm trees of Bani Al-Nadir burnt and cut down at a place called Al- Buwaira. Allah then revealed: "What you cut down of the date-palm trees (of the enemy) Or you left them standing on their stems. It was by Allah's Permission." (59.5) Translation Not Available

Book Ref: Sahih Bukhari Book 64 Hadith 4031
Web Ref:  Sahih Bukhari Vol 5 Book 59 Hadith 365