Musnad Abu Ya'la al-Mawsili 139:2

Abu Khaythama narrated to us, Mu'adh ibn Mu'adh and Jarir narrated to us, they said: Sulayman al-Taymi narrated to us, he said: Anas narrated to us, he said: Two men sneezed in the presence of the Prophet, may Allah bless him and grant him peace. He responded to one of them [with the prayer of mercy] and did not respond to the other. He said: "This one praised Allah, but this one did not praise Allah."