Sahih Muslim
Sahih Muslim Book 002, Hadith Number 0439.
Hadith Section/Book: Sahih Muslim Sahih Muslim Book 02. Purification
Chapter : The merit of Wudu and that of prayer after it.
This Hadith is also narrated on the authority with the same chain of transmitters and in the Hadith of Abu Usama the words are: "He who performed the ablution well and then offered the obligatory prayer."