(Imām Bukhārī narrates): Qabīsah narrated to us, he said: Sufyān narrated to us, from 'Amr ibn Dīnār, from Tāwūs, from Ibn 'Abbās, may Allāh be pleased with them both, he narrates that:
the Prophet ﷺ was commanded to prostrate upon seven limbs, and that he should not fold up his hair or fold up his garment. (Those seven limbs are:) the forehead, the two hands, the two knees, the two feet.
Reference: Sahih Al Bukhari 809