وَعَدَمُ ارْتِفَاعِ مَحَلِّ السُّجُودِ عَنْ مَوْضِعِ الْقَدَمَيْنِ بِأَكْثَرَ مِنْ نِصْفِ ذِرَاعٍ ... إِلَّا لِزَحْمَةٍ سَجَدَ فِيهَا عَلَى ظَهْرِ مُصَلٍّ صَلَاتَهُ
Normally the place of the forehead cannot be more than half a cubit above the feet. In genuine crowding, the source allows prostrating on the back of another worshipper who is in the same prayer when the required conditions are met.
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Prayer Pillars: Ruku and Sujud
وَعَدَمُ ارْتِفَاعِ مَحَلِّ السُّجُودِ عَنْ مَوْضِعِ الْقَدَمَيْنِ بِأَكْثَرَ مِنْ نِصْفِ ذِرَاعٍ ... إِلَّا لِزَحْمَةٍ سَجَدَ فِيهَا عَلَى ظَهْرِ مُصَلٍّ صَلَاتَهُ
Normally the place of the forehead cannot be more than half a cubit above the feet. In genuine crowding, the source allows prostrating on the back of another worshipper who is in the same prayer when the required conditions are met.