Abu Hurairah (May Allah be pleased with him) reported:
The Messenger of Allah (ﷺ) said, "When there comes the middle of Sha'ban, don't observe Saum (fasting)."[At-Tirmidhi]. (DE)
App reference (DE): Book 9, Hadith 236 (DE)
Arabic/English book reference (DE): Book 9, Hadith 1226 (DE)