The man kept asking for bread because he felt that having those loaves in his possession was absolutely necessary to carry out his duty as a host.
مَاذَا يُظْهِرُ هذَا ٱلْمَثَلُ عَنِ ٱلسَّبَبِ ٱلَّذِي يَدْفَعُنَا إِلَى ٱلصَّلَاةِ بِلَجَاجَةٍ ؟‏