ASK PERMISSION BEFORE SITTING BETWEEN TWO PEOPLE H 838 "It is not permissible for a person to position himself between two people without their consent." R 838 Abu Daud and Tirmidhi with a chain up to Amr, the son of Shuaib who related on the authority of his father and grandfather that the Prophet, praise and peace be upon him, said this.
828- وعن عمرو بن شُعَيْب، عن أبيهِ، عن جَدِّهِ رضي الله عنه : أنَّ رسول الله صلى الله عليه وآله وسلم ، قَالَ : "لاَ يَحِلُّ لِرَجُلٍ أنْ يُفَرِّقَ بَيْنَ اثْنَيْنِ إِلاَّ بإذْنِهِمَا" رواه أَبُو داود والترمذي ، وقال: "حديث حسن" . وفي رواية لأبي داود : "لاَ يُجْلسُ بَيْنَ رَجُلَيْنِ إِلاَّ بِإذْنِهِمَا" .