Abu Huraira reported that the Messenger of Allah (peace be upon him) had said: Richness does not lie in the abundance of (worldly) goods but richness is the richness of the soul (heart, self).
Sahih Muslim, Book 12, Hadith 157

Abu Hurairah narrated that: the Prophet (peace be upon him) said:
“The fast is the day the people fast, the breaking of the fast is the day the people break their fast, and the sacrifice is the day the people sacrifice.”
Jami` at-Tirmidhi, Vol. 2, Book 8, Hadith 16

It was narrated from Umm Salamah: That the Messenger of Allah (peace be upon him) would not fast any two consecutive months except Shaban and Ramadan.
Sunan an-Nasa’I, Vol. 3, Book 22, Hadith 263

Narrated Abu Huraira: I heard Allah’s Messenger (peace be upon him) saying regarding Ramadan, “Whoever prayed at night in it (the month of Ramadan) out of sincere Faith and hoping for a reward from Allah, then all his previous sins will be forgiven.” Sahih al-Bukhari...

Mutarrif, from the tribe of Banu ‘Amir bin Sa’sa’ah narrated that ‘Uthman bin Abul-‘As Ath-Thaqafi invited him to drink some milk that he poured for him. Mutarrif said: “I am fasting.” ‘Uthman said: “I heard the Messenger of Allah (peace be upon him) say: ‘Fasting is a shield against the...