Proverbs 22:21

To make thee know the certainty of the words of truth, That thou mayest carry back words of truth to them that send thee?

Luke 1:3-4

it seemed good to me also, having traced the course of all things accurately from the first, to write unto thee in order, most excellent Theophilus;

1 Peter 3:15

but sanctify in your hearts Christ as Lord: being ready always to give answer to every man that asketh you a reason concerning the hope that is in you, yet with meekness and fear:

John 20:31

but these are written, that ye may believe that Jesus is the Christ, the Son of God; and that believing ye may have life in his name.

1 John 5:13

These things have I written unto you, that ye may know that ye have eternal life, even unto you that believe on the name of the Son of God.

Treasury of Scripture Knowledge

Summary

That I might make thee know the certainty of the words of truth; that thou mightest answer the words of truth to them that send unto thee?

Answer

General references

Bible References

I

Luke 1:3
it seemed good to me also, having traced the course of all things accurately from the first, to write unto thee in order, most excellent Theophilus;
John 20:31
but these are written, that ye may believe that Jesus is the Christ, the Son of God; and that believing ye may have life in his name.
1 John 5:13
These things have I written unto you, that ye may know that ye have eternal life, even unto you that believe on the name of the Son of God.

Answer

1 Peter 3:15
but sanctify in your hearts Christ as Lord: being ready always to give answer to every man that asketh you a reason concerning the hope that is in you, yet with meekness and fear:

General references

Proverbs 18:20
A man's belly shall be filled with the fruit of his mouth; With the increase of his lips shall he be satisfied.

American Standard Version Public Domain