لَا تَجْلِسْ بَيْنَ رَجُلَيْنِ إِلَّا بِإِذْنِهِمَا
Do not sit between two people without their permission.
Source: أبو داود
لَا تَجْلِسْ is a singular prohibition, “do not sit.” رَجُلَيْنِ in بَيْنَ رَجُلَيْنِ is dual: “between two men.” In إِلَّا بِإِذْنِهِمَا, إِلَّا means “except,” and the pronoun هِمَا means “of those two.”
Two people may be sitting together for a conversation or another proper purpose. Inserting oneself between them without asking can be intrusive. Seeking permission respects their space, comfort, and ongoing exchange. The narration teaches more than seating arrangement: it is a rule of considerate behavior.