(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." (ES)
Reference (ES): Sunan an-Nasa'i 1034 (ES)
In-book reference (ES): Book 12, Hadith 6 (ES)
English translation (ES): Vol. 2, Book 12, Hadith 1035 (ES)