It is narrated from Sayyiduna Abu Zuhayr al-Anmari (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Do not kill locusts, for they are the greatest army of Allah."
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith is narrated from Abu Zuhayr (may Allah be pleased with him) only with this chain, and Isma'il bin Ayyash is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الواو / 9277
Hadith Takhrij«أخرجه الطبراني فى «الكبير» برقم: 757»