The Book of Pilgrimage
15/40. Chapter:
It is recommended to touch the two Yemeni Corners in Tawaf and not the other two corners
Sahih Muslim
وَحَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، وَزُهَيْرُ بْنُ حَرْبٍ، وَعُبَيْدُ اللَّهِ بْنُ سَعِيدٍ، جَمِيعًا عَنْ يَحْيَى، الْقَطَّانِ - قَالَ ابْنُ الْمُثَنَّى حَدَّثَنَا يَحْيَى، - عَنْ عُبَيْدِ اللَّهِ، حَدَّثَنِي نَافِعٌ، عَنِ ابْنِ عُمَرَ، قَالَ مَا تَرَكْتُ اسْتِلاَمَ هَذَيْنِ الرُّكْنَيْنِ - الْيَمَانِيَ وَالْحَجَرَ مُذْ رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَسْتَلِمُهُمَا فِي شِدَّةٍ وَلاَ رَخَاءٍ .
Ibn 'Umar (Allah be pleased with them) reported: I have not abandoned touching of Yamani corners (and kissing of) the Stone since I saw Allah's messneger (ﷺ) touching them both In hardship and ease.
Reference : Sahih Muslim 1268aIn-book reference : Book 15, Hadith 270USC-MSA web (English) reference : Book 7, Hadith 2909