Sunan Ibn Majah 1134
سنن ابن ماجه#1134HasanIt was narrated from ‘Amr bin Shu’aib, from his father, that his grandfather said:“The Messenger of Allah (ﷺ) forbade Ihtiba’ (sitting with one's thighs gathered up against the stomach while wrapping one's arm or garment around them) on Fridays, meaning, when the Imam is delivering the sermon.”
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniHasan
Muhammad Fouad Abd al-BaqiHasan
Zubair Ali ZaiHasan
In-book reference: 5:332