What does the Bible say about being in Christ Jesus?

The phrase 'in Christ Jesus' encapsulates the essence of the Gospel, signifying a believer's union with Christ where they receive all spiritual blessings. Ephesians 1:3 states that God has blessed us with all spiritual blessings in heavenly places in Christ. This means that our identity and security in God stem from our connection to Christ, encompassing righteousness, sanctification, and redemption. To be 'in Christ' is to be seen as holy and accepted by God, as all that He provides is entirely in His Son.