Ibn ‘Umar said I have not seen the Apostle of Allaah ﷺ touching anything in the House (the Ka’bah) but the two Yamani corners. (Using translation from Abū Dāʾūd 1874)  

لَمْ أَرَ رَسُولَ اللهِ ﷺ «يَمْسَحُ مِنَ الْبَيْتِ إِلَّا الرُّكْنَيْنِ الْيَمَانِيَّيْنِ»