Musnad Ahmad 33:29

'Abd al-Razzaq narrated to us, Ibn Jurayj informed us, 'Amr ibn Dinar informed me that he heard Jabir ibn 'Abd Allah saying: When the Ka'bah was being built, the Prophet, peace and blessings of Allah be upon him, and al-'Abbas went to carry stones. Al-'Abbas said: "Place your lower garment over your neck to protect it from the stones." He did so, then he fell to the ground and his eyes stared up toward the sky. Then he stood up and said: "My lower garment, my lower garment!" So he tightened his lower garment upon himself.