(2) باب الإِمْسَاكِ بِالرُّكَبِ فِي الرُّكُوعِ
It was narrated that 'Umar said:
"It is established for you to hold the knees, so hold the knees." (RU)
Reference (RU): Sunan an-Nasa'i 1034 (RU)
In-book reference (RU): Book 12, Hadith 6 (RU)
English translation (RU): Vol. 2, Book 12, Hadith 1035 (RU)