The Prophet (ﷺ) saw a man performing Tawaf of the Ka`ba tied with a string or something else. So the Prophet cut that string.
Sahih al-Bukhari Book 25, Hadith 106
← Previous Hadith While the Prophet (ﷺ) was performing Tawaf of the Ka`ba, he passed by a person who had tied his hands to another person with a rope or string or something like that. The Prophet (ﷺ) cut it with his own hands and said, "Lead him by the hand."

Sahih al-Bukhari Book 25, Hadith 105 Next Hadith → In the year prior to the last Hajj of the Prophet (ﷺ) when Allah's Messenger (ﷺ) made Abu Bakr the leader of the pilgrims, the latter (Abu Bakr) sent me in the company of a group of people to make a public announcement: 'No pagan is allowed to perform Hajj after this year, and no naked person is allowed to perform Tawaf of the Ka`ba.' (See Hadith No. 365 Vol. 1)

Sahih al-Bukhari Book 25, Hadith 107