Ibn `Abbas said, "They used to dislike facing the sky with their private
parts, particularly during sexual relations. Therefore, Allah revealed this
verse.'' Al-Bukhari recorded by way of Ibn Jurayj, who reported from Muhammad
bin `Abbad bin Ja`far who said, "Ibn `Abbas recited, (أَلَا إِنَّهُمْ تَثْنَونِي
صُدُورُهُمْ) "Behold their breasts did fold up.'' So I said: `O Abu Al-`Abbas!
What does -their breasts did fold up- mean' He said, `The man used to have sex
with his woman, but he would be shy, or he used to have answering the call of
nature (in an open space) but, he would be shy. Therefore, this verse,
[أَلا إِنَّهُمْ
يَثْنُونَ صُدُورَهُمْ]
(No doubt! They did fold up their breasts,) was revealed.''' In another
wording of this narration, Ibn `Abbas said, "There were people who used to be
shy to remove their clothes while answering the call of nature in an open space
and thus be naked exposed to the sky. They were also ashamed of having sexual
relations with their women due to fear of being exposed towards the sky. Thus,
this was revealed concerning them.'' Al-Bukhari reported that Ibn `Abbas said
that
[يَسْتَغْشُونَ]
(they cover themselves) means that they cover their heads.
[وَمَا مِن دَآبَّةٍ
فِي الاٌّرْضِ إِلاَّ عَلَى اللَّهِ رِزْقُهَا وَيَعْلَمُ مُسْتَقَرَّهَا
وَمُسْتَوْدَعَهَا كُلٌّ فِى كِتَابٍ مُّبِينٍ ]
(6. And no moving creature is there on earth but its provision is due from
Allah. And He knows its dwelling place and its deposit. All is in a Clear Book.)