´It was narrated from Abu Hurairah that the Messenger of Allah (ﷺ) said:` ‘Do not anticipate Ramadan by fasting one or two days before, except for a man who has a habitual pattern of fasting, in which case let him fast.”
Hadith ReferenceSunan Ibn Majah / The Book of Fasting / Hadith: 1650
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:بخاري ومسلم