As for someone who hears a man reciting without having sat down to listen for any of the purposes mentioned, he is not required to prostrate when the reciter does. It has also been said that he is required to do so, but this is an anomalous opinion.
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As for the rulings governing this prostration, they are the same as those governing voluntary prayer: it may not be performed without ritual purity, in an unclean place, at a time when prayer is not permitted, or facing a direction other than the qiblah, except by a traveller riding his mount, who may prostrate in whichever direction it carries him.
There are three opinions concerning the prostration of recitation after the dawn prayer, before daylight grows bright, and after the afternoon prayer, before the sun turns yellow. The first is that one should not prostrate during either of these periods. This is Mālik’s position in al-Muwatta’, by analogy with voluntary prayers. The second is that one should prostrate during these periods. This is his position in al-Mudawwanah, by analogy with funeral prayers. The third is that one should prostrate after the dawn prayer but not after the afternoon prayer. This is the position of Mutarrif and Ibn al-Mājishūn in al-Wādihah.