Paul's letter to the Colossians was addressed: 'To the saints and faithful brethren in Christ who are in Colosse' (1:2). Later in this letter Paul writes, 'Therefore, as the elect of God, holy and beloved, put on tender mercies, kindness, humility, meekness, longsuffering...' (3:12).
In Paul's letter to the Romans, he writes, 'If God is for us, who can be against us? He who did not spare His own Son, but delivered Him up for us all, how shall He not with Him also freely give us all things? (8:31-32). Clearly Jesus was delieverd up for the Christian believers in Rome. This is who 'us' refers to. In the next verse Paul writes, 'Who shall bring a charge against God's elect? It is God who justifies' (8:33).
The elect are the born again believers who have been baptized in the name of Jesus Christ for the forgiveness of sins and received the gift of the Holy Spirit (see Acts 2:38).