´Narrated 'Abdullah bin 'Amr:` that the Messenger of Allah (ﷺ) said: "It is not lawful for a man to separate two people except with their permission."
Explanation & Benefits
Shaykh Dr. Abdur Rahman Freywai
Explanation:
1:
It is understood from this that it is not permissible for anyone to sit between two people who are seated without their permission. If both of them grant permission, then there is no harm in sitting there.
Source: Sunan al-Tirmidhi – Majlis ‘Ilmi Dar al-Da‘wah, New Delhi Edition, Page: 2752