(332) بَابُ لا يُحِدُّ الرَّجُلُ إِلَى أَخِيهِ النَّظَرَ إِذَا وَلَّى
Mujahid said, "It is disliked for a man to stare at his brotheror let his eye follow him when he turns his back or to ask, 'Where haveyou come from? Where are you going?'"
Reference: Al-Adab Al-Mufrad 771
In-book reference: Book 33, Hadith 18
English translation: Book 33, Hadith 771