Mujahid said, "It is disliked for a man to stare at his brother or let his eye follow him when he turns his back or to ask, 'Where have you come from? Where are you going?'"  

أَنْ يُحِدَّ الرَّجُلُ إِلَى أَخِيهِ النَّظَرَ أَوْ يُتْبِعَهُ بَصَرَهُ إِذَا وَلَّى أَوْ يَسْأَلَهُ مِنْ أَيْنَ جِئْتَ وَأَيْنَ تَذْهَبُ؟