Musnad Abu Ya'la al-Mawsili 147:56

Shayban ibn Farrukh narrated to us, Sa'id ibn Sulaym al-Dabbi narrated to us, Anas ibn Malik narrated to us: The Messenger of Allah (peace be upon him) said: Allah said: "If I take away the two precious things of My servant, I will not be satisfied with a reward for him less than Paradise." I said: "O Messenger of Allah, even if it is one?" He said: "Even if it is one."