Sunan Abi Dawud — General Behavior (Kitab Al-Adab) — Hadith No: 5029
Translation
Narrated AbuHurayrah: When the Messenger of Allah (ﷺ) sneezed, he placed his hand or a garment on his mouth, and lessened the noise. The transmitter Yahya is doubtful about the exact words khafada or ghadda (lessened)