Sahih Bukhari
Afflictions and the End of the World
Volume: 009 / Book Number: 088 / Hadith Number: 196
Narrated Abu Musa:
The Prophet said, "If anyone of you passed through our mosque or through our market while carrying arrows, he should hold the iron heads," or said, "..... he should hold (their heads) firmly with his hand lest he should injure one of the Muslims with it."