(40) باب اسْتِحْبَابِ اسْتِلاَمِ الرُّكْنَيْنِ الْيَمَانِيَيْنِ فِي الطَّوَافِ دُونَ الرُّكْنَيْنِ الآخَرَيْن
Ibn 'Abbas (Allah be pleased with them) is reported to have said that he did not see Allah's Messenger (ﷺ) touching other than the Yamani corners.
Reference: Sahih Muslim 1269
In-book reference: Book 15, Hadith 272
USC-MSA web (English) reference(deprecated numbering scheme): Book 7, Hadith 2911