How can I confront a person who is lying to me?

How do I deal with a Christian when I believe he has been untruthful with me?

The New Testament statement, "lie not one to another" Ephesians 4:25), clearly indicates believers could be untruthful with one another. Examples from Scripture underline God's displeasure with untruthfulness: Cain lied about his brother (Genesis 4:9); Ananias lied to the Holy Spirit (Acts 5:4). To be helpful, it would be prudent, after much prayer, to show the apparently untruthful believer the serious view that Divine Persons have of their action. The suspecting believer is thus attempting to convince him to be transparent and honest. Remember, there is more convincing power in the Word of God than in our own attempts to correct our brother.

H. S. Wells