I was sitting with my father and there was also a boy with him. He got up and then returned. So my father mentioned a tradition on the authority of Abu Hurairah from the Prophet ﷺ saying: If anyone gets up from where he has been sitting and comes back to it, he has most right to it.  

كُنْتُ عِنْدَ أَبِي جَالِسًا وَعِنْدَهُ غُلاَمٌ فَقَامَ ثُمَّ رَجَعَ فَحَدَّثَ أَبِي عَنْ أَبِي هُرَيْرَةَ عَنِ النَّبِيِّ ﷺ قَالَ إِذَا قَامَ الرَّجُلُ مِنْ مَجْلِسٍ ثُمَّ رَجَعَ إِلَيْهِ فَهُوَ أَحَقُّ بِهِ  

The Messenger of Allah ﷺ would sit and we would also sit around him. If he got up intending to return, he would take off his sandals or something he was wearing, and his Companions recognising his purpose (that he would return) would stay where they were.  

أَبُو الدَّرْدَاءِ كَانَ رَسُولُ اللَّهِ ﷺ إِذَا جَلَسَ وَجَلَسْنَا حَوْلَهُ فَقَامَ فَأَرَادَ الرُّجُوعَ نَزَعَ نَعْلَيْهِ أَوْ بَعْضَ مَا يَكُونُ عَلَيْهِ فَيَعْرِفُ ذَلِكَ أَصْحَابُهُ فَيَثْبُتُونَ