Abu Ash-Sha'tha said, "Who keeps away from some portion of the Ka'bah?" Mu'awiya used to touch the four corners of the Ka'bah, Ibn 'Abbas said to him, "These two corners (the one facing the Hijr) are not to be touched." Mu'awiya said, "Nothing is untouchable in the Ka'bah." And Ibn Az-Zubair used to touch all the corners of the Ka'bah.  

أَنَّهُ قَالَ وَمَنْ يَتَّقِي شَيْئًا مِنَ الْبَيْتِ وَكَانَ مُعَاوِيَةُ يَسْتَلِمُ الأَرْكَانَ فَقَالَ لَهُ ابْنُ عَبَّاسٍ ؓ إِنَّهُ لاَ يُسْتَلَمُ هَذَانِ الرُّكْنَانِ فَقَالَ لَيْسَ شَىْءٌ مِنَ الْبَيْتِ مَهْجُورًا وَكَانَ ابْنُ الزُّبَيْرِ ؓ يَسْتَلِمُهُنَّ كُلَّهُنَّ  

"I have not seen the Prophet ﷺ touching except the two Yemenite Corners (i.e. the ones facing Yemen)."  

لَمْ أَرَ النَّبِيَّ ﷺ يَسْتَلِمُ مِنَ الْبَيْتِ إِلاَّ الرُّكْنَيْنِ الْيَمَانِيَيْنِ