مُسْنَدُ أَحْمَدَ
Musnad Ahmad 1369
Musnad 'Ali Ibn Abi Talib
It was narrated that ‘Ali (رضي الله عنه) said: The Messenger of Allah (ﷺ) said to me: “Do not follow one glance with another; you may be allowed the first but not the second."
Musnad Ahmad 1369Hasan because of corroborating evidence]