Sayyiduna Abu Hurayrah (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "When half of Sha'ban has passed, refrain from fasting until Ramadan begins."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 7961
Sayyiduna Abu Hurayrah (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "When half of Sha'ban has passed, do not fast."
Abu Dawud said: Ahmad bin Hanbal said: This hadith is munkar (denounced). He said: And Abdur-Rahman would not narrate it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 7962