﴿ أَعَدَّ ٱللَّهُ لَهُمْ جَنَّٰتٍۢ تَجْرِى مِن تَحْتِهَا ٱلْأَنْهَٰرُ خَٰلِدِينَ فِيهَا ۚ ذَٰلِكَ ٱلْفَوْزُ ٱلْعَظِيمُ ﴾

“God has readied for them gardens through which running waters flow, therein to abide: and this is the triumph supreme!”

The expression: اُولُوا الطَّولِ (ulu 'at-caul: translated as ` the capable ones' ) (86) is not for particularization. Instead, it serves a purpose. It tells that there were others too, the ones not so capable. And the incapable ones had, at least, some obvious excuse to stay behind.