Musnad Ahmad 658:78

Yahya narrated to us, from Shu'bah, who said: Abu Ishaq narrated to us, who said: I heard Al-Bara' ibn 'Azib say: "The Prophet, peace and blessings of Allah be upon him, made a peace treaty with the people of Makkah on the condition that they (the Muslims) would stay for three days, and they would not enter it except with the *jalban* of weapons." I said: "And what is the *jalban* of weapons?" He said: "The scabbard and what is inside it."