Musnad Abu Ya'la al-Mawsili 42:139

Ishaq narrated to us, Muhammad bin Jabir narrated to us, from Ali bin al-Aqmar, from al-Agharr Abu Muslim, from Abu Sa’id, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "If a man wakes up from the night and prays two rak'ahs, he is recorded among the men who remember Allah much and the women who remember."