Translation:

9. O ye who believe! let not your riches or your children divert you from the remembrance of Allah. If any act thus the loss is their own.

Notes (Tafseer)

5476. Riches and human resources of all kinds are but fleeting sources of enjoyment. They should not turn away the good man from his devotion to Allah. "Remembrance of Allah" includes every act of service and goodness, every kind thought and kind deed, for this is the service and sacrifice which Allah requires of us. If we fail in this, the loss is our own, not any one else's: for it stunts our own spiritual growth.