This phrase may remind us of the examples of Abraham and Lot. Both men showed kindness to visitors whom they did not know.
وَهٰذَا يُذَكِّرُنَا بِإِبْرَاهِيمَ وَلُوطٍ ٱللَّذَيْنِ أَظْهَرَا ٱللُّطْفَ لِزُوَّارٍ غُرَبَاءَ تَبَيَّنَ أَنَّهُمْ مَلَائِكَةٌ .‏