Sahih Muslim | Book 6 | Chapter 3

Narrated by Abu Huraira (Allah be pleased with him)
Abu Huraira (Allah be pleased with him) reported Allah's Messenger (may peace be upon him)as saying: Do not observe fast for a day, or two days ahead of Ramadan except a person who is in the habit of observing a particular fast; he may fast on that day.

Narrated by Yahya b. Abi Kathir
This hadith has been narrated on the authority of Yahya b. Abi Kathir with the same chain of transmitters.