عن أبي هريرة رضي الله عنه قال: كان رسول الله صلى الله عليه وسلم إذا عطس وضع يده أو ثوبه على فيه، وخفض -أو غض- بها صوته،
[صحيح] - [رواه أبو داود والترمذي وأحمد]
Abu Hurayrah (may Allah be pleased with him) reported: Whenever the Messenger of Allah (may Allah's peace and blessings be upon him) sneezed, he would cover his mouth with his hand or cloth, suppressing or lowering (the narrator was unsure), the sound therewith.
Sahih/Authentic. - [At-Tirmidhi]
This Hadīth explains one of etiquettes of sneezing. It is recommended for the one sneezing to avoid overreacting during sneezing, to lower his voice, and to cover his face if possible.