It wasnarrated that 'Abdullah bin Mughaffal said:
"The Prophet (ﷺ)forbade throwing small pebbles and said: 'They do not kill any gameorhurt the enemy, but they can break a tooth or put out an eye.'" (FR)
English reference (FR): Vol. 4, Book 28, Hadith 3227 (FR)
Arabic reference (FR): Book 28, Hadith 3349 (FR)