Umm Salama bint Abu Umaya reported,

The Prophet ﷺ did not fast a complete month of the year except Shaban, which he would join to Ramadan.

Azami 4425

Sahih

عن أم سلمة

عن النبي ﷺ أنه لم يكن يصوم من السنة شهرا تاما إلا شعبان يصله برمضان.

الأعظمي 4425صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Fasting
Chapter
Voluntary fasting and encouragement to do it
Section
Prophet ﷺ used to fast in Shaban and would connect his fast to the fast of Ramadan
Numbering
Jami al-Kamil 4425 (2nd edition)
Azami 4425