عَنِ الْعَبَّاسِ (بْنِ عَبْدِ الْمُطَّلِبِ) رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ: ((إِذَا سَجَدَ الرَّجُلُ سَجَدَ مَعَهُ سَبْعَةُ أَرَابٍ وَجْهُهُ وَكَفَّاهُ وَرُكْبَتَاهُ وَقَدَمَاهُ))
Sayyiduna Abbas bin Abdul Muttalib narrates that the Messenger of Allah (peace and blessings be upon him) said: When a person performs prostration, seven parts of his body prostrate along with him: the face, both palms, both knees, and both feet.