Matthew 6:24
No one can serve two masters, for either he will hate the one and love the other, or he will be devoted to the one and despise the other.  You cannot serve God and money.
 
In the Bible passage, Jesus clearly tells us that we can only have 1 God in our lives.  God doesn’t want a rival with our time, our emotions, our desires, our energy, and our focus. 
We cannot serve God and table tennis
We cannot serve God and our job
We cannot serve God and our stuff