Hadith 1301

Ubaidullah reported this hadith with the same chain of transmitters and (it is said) that it was on the fourth turn that he (the Holy Prophet) said: (May Allah have mercy upon) those who got their hair clipped."

وَحَدَّثَنَاهُ ابْنُ الْمُثَنَّى، حَدَّثَنَا عَبْدُ الْوَهَّابِ، حَدَّثَنَا عُبَيْدُ اللَّهِ، بِهَذَا الإِسْنَادِ وَقَالَ فِي الْحَدِيثِ فَلَمَّا كَانَتِ الرَّابِعَةُ قَالَ ‏"‏ وَالْمُقَصِّرِينَ ‏"‏ ‏.‏

Reference: 332090
In-book reference: Book 15, Hadith 1301 d
Hadith 1301 - The Book of I'tikaf - Sahih Muslim - Sunnah.com