His fasting is forbidden according to us, and according to us it is one of the six days on which fasting is forbidden, which are this day, the day of Eid al-Fitr, the day of Eid al-Adha, and the three days of al-Tashreeq

Al-Tirmidhi narrated on the authority of Abu Hurairah, who said that the Messenger of God, may God bless him and grant him peace, said: If he remains Half of Shaban, so do not fast

Abu Issa said this is a good and authentic hadith