The Book of Sacrifices (Kitab Al-Adahi)

Muslim :: Book 22 : Hadith 4871

Umm Salama reported (these words) directly from Allah's Messenger (may peace be upon him): If anyone has in his possession a sacrificial animal to offer as a sacrifice (on 'Id al-Adha), he should not get his hair cut and nails trimmed after he has entered the first days of Dhu'l Hijja