Narrated ‘Abu Huraira:
The Prophet (pbuh) said,

Seven people will be shaded by Allah under His shade on the day when there will be no shade except His. They are:
(1) a just ruler;

(2) a young man who has been brought up in the worship of Allah, (i.e. worship Allah (Alone) sincerely from his childhood),

(3) a man whose heart is attached to the mosque (who offers the five compulsory congregational prayers in the mosque);

(4) two persons who love each other only for Allah’s sake and they meet and part in Allah’s cause only;

(5) a man who refuses the call of a charming woman of noble birth for an illegal sexual intercourse with her and says: I am afraid of Allah;

(6) a person who practices charity so secretly that his left hand does not know what his right hand has given (i.e. nobody knows how much he has given in charity).

(7) a person who remembers Allah in seclusion and his eyes get flooded with tears.”

Sahih al-Bukhari, Obligatory Charity Tax (Zakat)
Book 24, Hadith 27

Narrated ‘`Abdullah bin `Amr bin Al-`As:
Allah’s Messenger (pbuh) told me, “The most beloved prayer to Allah is that of Dawud and the most beloved fasts to Allah are those of Dawud. He used to sleep for half of the night and then pray for one third of the night and again sleep for its sixth part and used to fast on alternate days.”

Sahih al-Bukhari, Book 19, Hadith 11