Is it permissible to fast the White Days in Sha‘ban, starting from the twelfth of the month if it falls on a Sunday, and is it disliked to complete fasting the entire month of Sha‘ban after fasting the White Days within it?

It is recommended to fast the 'White Days', which are the thirteenth, fourteenth, and fifteenth of the month. It is also recommended to fast frequently in the month of Sha’ban, following the example of the Prophet (peace and blessings be upon him). There is a prohibition against fasting in the second half of Sha’ban, except for those who have a regular habit of fasting. It is preferable to break the fast on the last two days of Sha’ban.