Musnad Ahmad 30:861

Sufyan ibn 'Uyaynah narrated to us, Yazid ibn Kaysan narrated to us, from Abu Hazim, from Abu Hurayrah, who said: A man proposed to a woman—meaning from the Ansar—so the Prophet, peace and blessings of Allah be upon him, said: "Look at her, for there is something in the eyes of the Ansar."