‏الصيام : Hadeeth No:2382 Abu Huraira (Allaah be pleased with him) reported Allaah's Messenger (sallAllaahu alayhi wa sallam) 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....

‏الإيمان : Hadeeth No:49 It is narrated on the authority of Aswad b. Hilal that he heard Mu'adh say this: The Messenger of Allaah (sallAllaahu alayhi wa sallam) called, me and I replied to him. He (the Prophet) said: Do you know the right of Allaah upon the people? and then followed the hadith (mentioned above)....