In Matthew 4:4 Jesus, quoting Deuteronomy 8:3, said, “Man shall not live by bread alone, but by every word that proceeds from the mouth of God.” We are responsible to obey everything that God has communicated to us. These days, however, many want to pick and choose what they will or will not obey. Some claim that they will only choose to obey things that are in accord with the teachings of Jesus, anything else they will reject. However, it was Jesus who told His apostles, “However, when He, the Spirit of truth, has come, He will guide you into all truth” (John 16:13) and “But the Helper, the Holy Spirit, whom the Father will send in My name, He will teach you all things, and bring to your remembrance all things that I have said to you.” (John 14:26). In other words, Jesus teaches that the words of the writers of the New Testament are authoritative. If we reject the teachings of the writers of the New Testament, we reject the teachings of Jesus.
Some pick and choose what they will obey in scripture based on whether or not they feel it is “relevant” to people today as if changing times justify changing God’s Word. They will reject what the apostle Paul said about the role of women in the public worship (“Let your women keep silent in the churches, for they are not permitted to speak” 1 Corinthians 14:34) justifying their changes by saying that, “times are different now”. In Malachi 3:6 God said, “For I am the Lord, I do not change”. Times and customs may change but God does not.
In 2 Timothy 3:16 Paul tells us that “All Scripture is given by inspiration of God”, literally, “God breathed” and thus part of that “every word that proceeds from the mouth of God” by which we are to live.
People give all kinds of reasons for picking and choosing which parts of scripture they will obey and which they won’t, but they all boil down to this; they choose to do what they like and ignore what they don’t.