Make intercession to me, you will be rewarded, for Allah decrees what he wishes by the tongue of his prophet.  

قَالَ رَسُولُ اللَّهِ ﷺ اشْفَعُوا إِلَىَّ لِتُؤْجَرُوا وَلْيَقْضِ اللَّهُ عَلَى لِسَانِ نَبِيِّهِ مَا شَاءَ  

Make intercession, you will be rewarded, for I purposely delay a matter so that you intercede and then you are rewarded. The Messenger of Allah ﷺ said: If you make intercession, you will be rewarded.  

عَنْ مُعَاوِيَةَ اشْفَعُوا تُؤْجَرُوا فَإِنِّي لأُرِيدُ الأَمْرَ فَأُؤَخِّرُهُ كَيْمَا تَشْفَعُوا فَتُؤْجَرُوا فَإِنَّ رَسُولَ اللَّهِ ﷺ قَالَ اشْفَعُوا تُؤْجَرُوا  

A similar tradition has also been transmitted by Abu Musa from the prophet (May peace be upon him) through a different chain of narrators.  

عَنِ النَّبِيِّ ﷺ مِثْلَهُ