The two feet of the son of Adam will not move away from his Lord on the day of Judgement until he is asked about five (matters):
 
1. about his life - how he spent it;
2. about his youth - how he took care of it;
3. about his wealth - how he earned it;
4. and where he spent it
5. and about that which he acted upon from the knowledge he acquired.

 
[Tirmidhi 2424, Hasan by Albani.]