Makhul al-Azdi said, "I was beside Ibn 'Umar when a man sneezed
on one side of the mosque. Ibn 'Umar said, 'May Allah have mercy on you
if you praised Allah.'"
حَدَّثَنَا عَاصِمُ بْنُ عَلِيٍّ، قَالَ: حَدَّثَنَا عِكْرِمَةُ، قَالَ: حَدَّثَنَا إِيَاسُ بْنُ سَلَمَةَ، عَنْ أَبِيهِ قَالَ: عَطَسَ رَجُلٌ عِنْدَ النَّبِيِّ صلى الله عليه وسلم فَقَالَ: يَرْحَمُكَ اللَّهُ، ثُمَّ عَطَسَ أُخْرَى، فَقَالَ النَّبِيُّ صلى الله عليه وسلم: هَذَا مَزْكُومٌ.
Iyas ibn Salama related that his father said, "A man sneezed in
the presence of the Prophet, may Allah bless him and grant him peace, and
the Prophet said, 'May Allah have mercy on you.' Then the man sneezed again
and the Prophet, may Allah bless him and grant him peace, said, 'This man
has a cold.'"
Mujahid said, "When a son of 'Abdullah ibn 'Umar, either Abu Bakr
or 'Umar, sneezed, he said, 'Ab!' Ibn 'Umar said, 'What is this "Ab"? Ab
is the name of one of the shaytans who comes between the sneeze and the
praise.'"
'Abdullah said, "When one of you sneezes, he should say, 'Praise
be to Allah, the Lord of the Worlds.' Let anyone responding to him say
'May Allah have mercy on you.' Then the person who sneezed should say'May
Allah forgive me and you.'"