Sunan an-Nasa'i 1035
سنن النسائي#1035SahihIt was narrated that 'Abdur-Rahman As-Sulami said:" 'Umar said: 'The Sunnah is to hold the knees
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih Isnaad
Al-AlbaniSahih Isnaad
Zubair Ali ZaiHasan
In-book reference: 12:7