Abu Dawud said: Ibn 'Umar used to sit in ihtiba position while the imam gave the Friday sermon. Anas b. Malik, Shuraih, Sa'sa'ah b. Sawhan, Sa'id b. al-Musayyib, Ibrahim al-Nakha'i, Makhul, Isma'il, Ismail b. Muhammad b. Sa'd, and Nu'aim b. Sulamah said: There is no harm in sitting in ihtiba position.
Abu Dawud said: I do not know whether anyone considered it disapproved except 'Ubadah b. Nasayy.
In-book : Book 2, Hadith 722
English translation : Book 2, Hadith 1106