Sahih Bukhari
Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
Volume: 005 / Book Number: 059 / Hadith Number: 365
Narrated Ibn Umar:
Allah's Apostle 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)