Sahih Muslim
The Book of Fasting (Kitab Al-Sawm)
Book Number: 006 / Hadith Number: 2467
This hadith is narrated on the authority of Zuhri with the same chain of transmitters. Yahya (one of the narrators) said that Sufyan (the narrator) had stated: I do not know whose statement it is:" It is the last word of the Messenger of Allah (may peace be upon him) which is accepted as (final as it abrogates the previous ones)."