Musnad Abu Ya'la al-Mawsili 139:15

Zuhayr ibn Harb narrated to us, Isma'il narrated to us, from Sulayman al-Taymi, Anas ibn Malik narrated to us, he said: Two men sneezed in the presence of the Prophet, may Allah bless him and grant him peace. He blessed one of them—or he said: he responded to one of them—and left the other. It was said to him: "These are two men who sneezed; you blessed one of them—or responded to one of them—and left the other." He said: "This one praised Allah, and this one did not praise Allah, the Mighty and Majestic."