Reward of a Hundred Thousand Ramadan
The one who spends Ramadan in Makka-tul-Mukarramah, keeps fasts and offers Salah at night as much as possible, ALLAH will reward him equivalent to one hundred thousand Ramadan spent elsewhere. He will give him the reward of freeing a slave every day and every night each as well as the reward of providing a horse for Jihad every day. He will also give him the reward of a good deed each day and each night.
(Sunan Ibn Majah, pp. 2666, Hadis 3117)