One who dies owing a fast from Ramadan which he neglected

It was narrated from Ibn ‘Umar that the Messenger of Allah ﷺ said:
‘Whoever dies owing the fasts of a month, one poor person should be fed on his behalf for each day.”

حَدَّثَنَا مُحَمَّدُ بْنُ يَحْيَى، حَدَّثَنَا قُتَيْبَةُ، حَدَّثَنَا عَبْثَرٌ، عَنْ أَشْعَثَ، عَنْ مُحَمَّدِ بْنِ سِيرِينَ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، قَالَ قَالَ رَسُولُ اللَّهِ ﷺ " مَنْ مَاتَ وَعَلَيْهِ صِيَامُ شَهْرٍ فَلْيُطْعَمْ عَنْهُ مَكَانَ كُلِّ يَوْمٍ مِسْكِينٌ " .