Musannaf Ibn Abi Shayba 9:1316

Husayn ibn Ali narrated to us, from Musa al-Juhani, who said: I was with Sa’id ibn Jubayr on a road. A woman approached us, and we all looked at her. Then Sa’id lowered his gaze, but I continued to look at her. Sa’id said to me: "The first [look] is for you, and the second is against you."