Surah Al-Hashr Verse 5

5375 The unnecessary cutting down of fruit trees or destruction of crops, or any wanton destruction whatever in war, is forbidden by the law and practice of Islam. But some destruction may be necessary for putting pressure on the enemy, and to that extent it is allowed. But as far as possible, consistently with that objective of military operations, such trees should not be cut down. Both these principles are in accordance with the Divine Will, and were followed by the Muslims in their expedition.5376 The arrogance of Banu al Nadir had to be humbled, and their power for mischief destroyed.