Musnad Ahmad 1153:1784

'Abd al-Malik ibn 'Amr narrated to us, he said: Ibn Abi Dhi'b narrated to us, from al-Harith ibn 'Abd al-Rahman and al-Mundhir ibn Abi al-Mundhir, from Abu Salamah, from 'Aishah, that the Prophet, peace and blessings of Allah be upon him, looked at the moon and said: "O 'Aishah, seek refuge in Allah from the evil of this, for this is the darkness (al-ghasiq) when it settles (idha waqab)."