What the Bible says about christian witness

1 Peter 3:15

But sanctify the Lord God in your hearts; and always be ready to give an answer to everyone who asks you a reason concerning the hope that is in you, with humility and fear:

2 Timothy 2:2

The things which you have heard from me among many witnesses, commit the same to faithful men, who will be able to teach others also.

Titus 2:7-8

in all things showing yourself an example of good works; in your teaching showing integrity, seriousness, incorruptibility, and soundness of speech that can’t be condemned; that he who opposes you may be ashamed, having no evil thing to say about us.

1 Timothy 4:12

Let no man despise your youth; but be an example to those who believe, in word, in your way of life, in love, in spirit, in faith, and in purity.

1 Peter 2:12

having good behavior among the nations, so in that of which they speak against you as evildoers, they may by your good works, which they see, glorify God in the day of visitation.

Colossians 4:5-6

Walk in wisdom toward those who are outside, redeeming the time. Let your speech always be with grace, seasoned with salt, that you may know how you ought to answer each one.

2 Corinthians 5:20

We are therefore ambassadors on behalf of Christ, as though God were entreating by us: we beg you on behalf of Christ, be reconciled to God.

Acts 1:8

But you will receive power when the Holy Spirit has come upon you. You will be witnesses to me in Jerusalem, in all Judea and Samaria, and to the uttermost parts of the earth.”

Mark 16:15

He said to them, “Go into all the world, and preach the Good News to the whole creation.

Proverbs 27:12

A prudent man sees danger and takes refuge; but the simple pass on, and suffer for it.