(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." (TR)
Reference (TR): Sunan an-Nasa'i 1176 (TR)
In-book reference (TR): Book 12, Hadith 148 (TR)
English translation (TR): Vol. 2, Book 12, Hadith 1177 (TR)