The Book of Hajj
24/136. Chapter:
Is it permissible to speak during Tawaf?
Sunan an-Nasai
أَخْبَرَنَا مُحَمَّدُ بْنُ سُلَيْمَانَ، قَالَ أَنْبَأَنَا السِّينَانِيُّ، عَنْ حَنْظَلَةَ بْنِ أَبِي سُفْيَانَ، عَنْ طَاوُسٍ، قَالَ قَالَ عَبْدُ اللَّهِ بْنُ عُمَرَ أَقِلُّوا الْكَلاَمَ فِي الطَّوَافِ فَإِنَّمَا أَنْتُمْ فِي الصَّلاَةِ .
Abdullah bin Umar said: "Speak little when you are perfoming Tawaf for you are in a state of Salah". (Sahih Mawquf)
Reference : Sunan an-Nasa'i 2923In-book reference : Book 24, Hadith 306English translation : Vol. 3, Book 24, Hadith 2926