Musnad Ahmad 30:292

Yahya narrated to us, from Ibn ‘Ajlan, Al-Qa‘qa‘ ibn Hakim narrated to me, from Abu Salih, from Abu Hurayrah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "May Allah have mercy on a man who stood at night, prayed, and woke his wife, and she prayed; and if she refused, he sprinkled water on her face. And may Allah have mercy on a woman who stood at night, prayed, and woke her husband, and he prayed; and if he refused, she sprinkled water on his face."