عَنِ ابْنِ عُمَرَ رَضِيَ اللَّهُ عَنْهُمَا أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ كَانَ يَسْتَلِمُ الرُّكْنَ الْيَمَانِيَّ وَالْأَسْوَدَ كُلَّ طَوْفَةٍ وَلَا يَسْتَلِمُ الرُّكْنَيْنِ الْآخَرَيْنِ اللَّذَيْنِ يَلِيَانِ الْحِجْرَ
It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) used to perform istilam (touching or kissing) of the Rukn Yamani and Hajar Aswad in every circuit while circumambulating the House of Allah, and he did not perform istilam of the two corners on the side of Hatim.