2 Corinthians 5:14-21 New Revised Standard Version (NRSV)
14 For the love of Christ urges us on, because we are convinced that one has died for all; therefore all have died. 15 And he died for all, so that those who live might live no longer for themselves, but for him who died and was raised for them.
16 From now on, therefore, we regard no one from a human point of view;[a] even though we once knew Christ from a human point of view,[b] we know him no longer in that way. 17 So if anyone is in Christ, there is a new creation: everything old has passed away; see, everything has become new! 18 All this is from God, who reconciled us to himself through Christ, and has given us the ministry of reconciliation; 19 that is, in Christ God was reconciling the world to himself,[c] not counting their trespasses against them, and entrusting the message of reconciliation to us. 20 So we are ambassadors for Christ, since God is making his appeal through us; we entreat you on behalf of Christ, be reconciled to God. 21 For our sake he made him to be sin who knew no sin, so that in him we might become the righteousness of God.
Matthew 5:33-37 New Revised Standard Version (NRSV)
33 “Again, you have heard that it was said to those of ancient times, ‘You shall not swear falsely, but carry out the vows you have made to the Lord.’ 34 But I say to you, Do not swear at all, either by heaven, for it is the throne of God, 35 or by the earth, for it is his footstool, or by Jerusalem, for it is the city of the great King. 36 And do not swear by your head, for you cannot make one hair white or black. 37 Let your word be ‘Yes, Yes’ or ‘No, No’; anything more than this comes from the evil one.[a]