It wasnarrated from Abu Hurairah that the Messenger of Allah (ﷺ)said:
'When it is the middle of Sha'ban, do not fast until Ramadancomes." (RU)
English reference (RU): Vol. 1, Book 7, Hadith 1651 (RU)
Arabic reference (RU): Book 7, Hadith 1720 (RU)