“Whoever is in Makkah when the month of Ramadan comes, and he
fasts
it and prays at night as much as he can, Allah will record for
him
(reward equivalent to that for) one hundred thousand months of
Ramadan observed elsewhere. For each day Allah will record for him
(reward equivalent to that for) freeing a slave, and for each day
(reward equivalent to that for) providing a horse in the cause of
Allah, and for every day merits and for every night merits.”
Sunan Ibn Majah Book 25, Hadith 236