Musnad Ahmad 5:431

Yahya narrated to us, from Ibn Abi Layla, my brother narrated to me, from my father, from Ali, from the Prophet, peace and blessings of Allah be upon him, who said: "If one of you sneezes, let him say: 'Praise be to Allah in every state.' And let it be said to him: 'May Allah have mercy upon you.' And let him say: 'May Allah guide you and rectify your state.'" I said to him: "From Abu Ayyub?" He said: "Ali."