Humaidbin Abu Sawiyyah said:
I heard Ibn Hisham asking 'Ata' bin AbuRabah about the Yemenite Corner, when he was performing Tawaf aroundthe House. 'Ata' said: Abu Hurairah told me that the Prophet(ﷺ) said: "Seventy angels have been appointed over it. Whoeversays: Allahumma inni as'alukal-'afwa wal-'afiyah fid-dunyawal-akhirah; Rabbana atina fid-dunya hasanah, wa fil-akhiratihasanah, wa qina 'adhaban-Nar (O Allah, I ask You for pardon andwell-being in this world and in the Hereafter. Our Lord, give us goodin this world and good in the Hereafter and protect us from thetorment of the Fire), they say: Amin." When he reached the BlackCorner (where the Black Stone is), he said: O Abu Muhammad! What haveyou heard about this Black Corner? 'Ata' said: Abu Hurairah toldme that he heard the Messenger of Allah (ﷺ) say: "Whoever facesit is facing the Hand of the Most Merciful.'"Ibn Hisham said to him: O Abu Muhammad, what about Tawaf? 'Ata' said: Abu Hurairah told me that he heard the Prophet (ﷺ) say: "Whoever performs Tawaf around the House seven times and does not say anything except: Subhan Allah wal-hamdu lillah, wa la ilaha illallah wa Allahu Akbar, wa la hawla wa la quwwata illa billah (Glory is to Allah, praise is to Allah, none has the right to be worshipping but Allah, and there is no power nor strength except with Allah), ten bad deeds will be erased from him, ten merits will be recorded for him, and he will be raised ten degrees in status. Whoever performs Tawaf and talks when he is in that situation, is wading in mercy like one who wades in water."
English reference: Vol. 4, Book 25, Hadith 2957
Arabic reference: Book 25, Hadith 3070