Ibn 'Abbas said that he said that "the squanderers" were those who wasted money incorrectly.

حَدَّثَنَا عَارِمٌ، قَالَ‏:‏ حَدَّثَنَا هُشَيْمٌ، قَالَ‏:‏ حَدَّثَنَا حُصَيْنٌ، عَنْ عِكْرِمَةَ، عَنِ ابْنِ عَبَّاسٍ‏:‏ ‏{‏الْمُبَذِّرِينَ‏}‏، قَالَ‏:‏ الْمُبَذِّرِينَ فِي غَيْرِ حَقٍّ‏.‏