(105) باب التَّخْفِيفِ فِي التَّشَهُّدِ الأَوَّلِ
It was narrated that 'Abdullah bin Mas'ud said:
"In the first two rak'ahs the Prophet (ﷺ) was as if he were on stones heated by fire." (PT)
Reference (PT): Sunan an-Nasa'i 1176 (PT)
In-book reference (PT): Book 12, Hadith 148 (PT)
English translation (PT): Vol. 2, Book 12, Hadith 1177 (PT)