You should always speak the truth, in all situations and circumstances. You are to give yourself earnestly to doing the right thing and practising your faith in all sincerity.
You have a new life, you are a new man which is created in righteousness and holiness. You are to put away the work of the flesh and live your life according to the written word of God.
Don’t be found lying, It is not part of your new nature in Christ Jesus. Therefore, quit all that are wrong and focus on living the true life God has given you.