Sahih Bukhari
Oneness, Uniqueness of Allah (Tawheed)
Volume: 009 / Book Number: 093 / Hadith Number: 625
Narrated Ibn Mas'ud:
A man asked the Prophet "What deeds are the best?" The Prophet said: (1) To perform the (daily compulsory) prayers at their (early) stated fixed times, (2) To be good and dutiful to one's own parents. (3) and to participate in Jihad in Allah's Cause."