Phil 2:5 Think this in yourselves which was also in Christ Jesus.
It is a mistake to presume that the New Testament (or the Old Testament) contains a systematic delineation of how a Christian makes ethical decisions. Nevertheless, the New Testament often demonstrates and explains what is right and wrong behavior and how Christians ought to live to please the one God through the Lord Jesus Christ and the Holy Spirit.
Nijay K. Gupta, “Ethics, Christian,” ed. John D. Barry et al., The Lexham Bible Dictionary (Bellingham, WA: Lexham Press, 2016).