Musnad Abu Ya'la al-Mawsili 108:92

Amr ibn Muhammad al-Naqid narrated to us, Hushaym ibn Bashir narrated to us, Abu al-Zubayr informed us, from Jabir, he said: The Messenger of Allah (ﷺ) said: "No man shall spend the night with a woman in a house, unless he is a husband or a mahram (an unmarriageable relative)."