Nafi' reported on the authority of 'Abdullah (Allah be pleased with him) that Messenger of Allah (way peace be upon him) did not touch but the Stone and the Yamani corner.
أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ لاَ يَسْتَلِمُ إِلاَّ الْحَجَرَ وَالرُّكْنَ الْيَمَانِيَ