Is it permissible to fast in order to welcome Ramadan?

It is known that the Prophet (peace be upon him) used to fast more voluntary fasts in the months of Rajab and Sha'ban compared to other months (Bukhari, Sawm, 52 [1969-1970]; Muslim, Siyam, 175-179 [1156-1157]) or recommended doing so (Abu Dawud, Sawm, 54 [2428]; Ibn Majah, Siyam, 43 [1741]). However, it is not correct to interpret the Prophet’s (peace be upon him) practice as fasting specifically to welcome Ramadan. There is no religious basis for fasting with the intention of welcoming Ramadan. It is also disliked (makruh) to fast one or two days before Ramadan out of caution, thinking that Ramadan may have started, when the month has not yet begun. In religious terminology, this day is called “the day of doubt” (yawm al-shakk). However, there is no objection to fasting on the day of doubt if it is not with the intention of welcoming Ramadan. Indeed, the Prophet (peace be upon him) said, “Do not fast one or two days before Ramadan. However, if a person is accustomed to fasting on those days, let him fast.” (Muslim, Siyam, 21 [1082]; see also Bukhari, Sawm, 14 [1914]).

Source: T.C. Diyanet İşleri Başkanlığı, Din İşleri Yüksek Kurulu