´Abu Hurairah narrated that :` the Messenger of Allah said: "Do no precede the month of Ramadan by fasting a day or two before it, unless it is the case of a man who normally performs some fast, then let him fast it."
Hadith ReferenceSunan at-Tirmidhi / The Book on Fasting / Hadith: 685
Hadith Gradingالألبانی:صحيح، ابن ماجة (1650)
Hadith Takhrij«انظر ما قبلہ ( تحفة الأشراف : 15406) (صحیح)»