Musannaf Ibn Abi Shayba 3:1102

Abu Bakr narrated to us, he said: Abd al-Aziz ibn Muhammad al-Darawardi narrated to us, from Musa ibn Ibrahim, from Salamah ibn al-Akwa, that he said: I said, "O Messenger of Allah, I hunt, so may I pray in a single garment?" He said, "Yes, and fasten it, even if with a thorn."