Musannaf Ibn Abi Shayba 3:4107

Waki’ narrated to us, he said: Fudayl ibn Ghazwan narrated to us, from Nafi’, from Ibn Umar, that he disliked *al-sadl* (letting the garment hang down) in prayer, in opposition to the Jews, and he said: "Indeed, they let their garments hang down."