"I was sent in advance of the Hour, so that I precede it like this precedes this." (Indicating) with his index and middle fingers.  

عَنِ النَّبِيِّ ﷺ قَالَ بُعِثْتُ فِي نَفَسِ السَّاعَةِ فَسَبَقْتُهَا كَمَا سَبَقَتْ هَذِهِ هَذِهِ لإِصْبُعَيْهِ السَّبَّابَةِ وَالْوُسْطَى  

"The Hour and I were dispatched like these two" - and Abu Dawud(a narrator) indicated with his index and middle fingers- so, how much more(in length) is one then the other.  

قَالَ رَسُولُ اللَّهِ ﷺ بُعِثْتُ أَنَا وَالسَّاعَةَ كَهَاتَيْنِ وَأَشَارَ أَبُو دَاوُدَ بِالسَّبَّابَةِ وَالْوُسْطَى فَمَا فَضْلُ إِحْدَاهُمَا عَلَى الأُخْرَى