Hadith #4844 (Sunan Abi Dawud)
Book: General Behavior (Kitab Al-Adab)
Narrator(s): Abdur Rahman bin Abi Sa'id al-Khudri عبد الرحمن بن أبي سعيد, Abu Sa'id al-Khudri, Ishaq bin Muhammad al-Ansari إسحاق بن محمد الأنصاري, Rabi' bin 'Abdur Rahman ربيح بن عبد الرحمن بن أبي سعيد الخدري, Salmah bin Shbyb سلمة بن شبيب
Grade: Hasan

The Messenger of Allah (ﷺ) said: One should not sit between two men except with their permission.

Source: https://parallelquran.com/hadith/sunan-abi-dawud-4844/