Whenever you serve others in any way, you are actually serving God. Another term for serving God is the word ministry. In the Bible, the words servant and minister are synonyms, as are service and ministry. If you are a Christian, you are a minister, and when you are serving, you are ministering.
“It is God himself who has made us what we are and given us new lives from Christ Jesus; and long ages ago he planned that we should spend these lives in helping others.” Ephesians 2:10 (TLB)