I watched some of the Youtube recordings of lectures given by Sinclair Ferguson and I am now uncertain which one it was in which he stated that in Colossians we see that 'we are given a new identity'. So I cannot now refer to it but I remember the wording distinctly.
However, just searching under the words indicates that is is a concept common in what might be considered evangelical Christianity today.
But I am personally unfamiliar with this concept, myself, and can think of nowhere in scripture where wording like this, as such, is used.
I know that the Son of man states, Revelation 2:17, that 'to him that overcometh ... I will give ... a white stone and in the stone a new name written ...' but that does not - exactly - say that the new name is the person's new name. And a new name is not, necessarily, the same as a new 'identity'.
Jesus gave Simon a new name (Peter) but that did not change his identity and he was thereafter known as 'Simon', 'Simon Peter'or 'Peter'.
The names written upon persons in Revelation 3:12 are the name of God, the name of the city of God and the new name of the Son of man : not their own name, new or otherwise.
Paul says 'I am crucified with Christ, nevertheless I live, yet not I but Christ liveth in me', Galatians 2:20, but the indwelling of the Holy Spirit, in union with the spirit of the believer, is not anything to do with an alteration to identity. It is a union of spirit, in which union (of Holy Spirit) Christ himself dwells within.
I am therefore left somewhat mystified by the expression 'given a new identity' and would like to ask if anyone can further enlighten me either from Sinclair Ferguson's other utterances or from reformed theology generally, what is meant by the expression and what texts are brought forward in order to support the concept.