“The Messenger of Allah (ﷺ) used to join Sha’ban to Ramadan.”
Sunan Ibn Majah Book 7, Hadith 11
← Previous Hadith “The Messenger of Allah (ﷺ) used to say from the pulpit, before the month of Ramadan: ‘Fasting will begin on such and such a day, but we are going to start fasting earlier, so whoever wants to start fasting earlier (i.e., in Sha’ban), let him do so, and whoever wants to wait until Ramadan begins, let him do so.’”

Sunan Ibn Majah Book 7, Hadith 10 Next Hadith → “He used to fast all of Sha’ban, until he joined it to Ramadan.”

Sunan Ibn Majah Book 7, Hadith 12