Here are ten scriptures that emphasize the importance and intent of apologetics:
2 Corinthians 10:4–5: For the weapons of our warfare are not of the flesh but have divine power to destroy strongholds. 5 We destroy arguments and every lofty opinion raised against the knowledge of God, and take every thought captive to obey Christ
Colossians 2:8: See to it that no one takes you captive by philosophy and empty deceit, according to human tradition, according to the elemental spirits of the world, and not according to Christ.
1 Peter 3:15: but in your hearts honor Christ the Lord as holy, always being prepared to make a defense to anyone who asks you for a reason for the hope that is in you; yet do it with gentleness and respect
Jude 3: Beloved, although I was very eager to write to you about our common salvation, I found it necessary to write appealing to you to contend for the faith that was once for all delivered to the saints.
Colossians 4:5–6: Walk in wisdom toward outsiders, making the best use of the time. 6 Let your speech always be gracious, seasoned with salt, so that you may know how you ought to answer each person.
2 Timothy 2:24–25: And the Lord’s servant must not be quarrelsome but kind to everyone, able to teach, patiently enduring evil, 25 correcting his opponents with gentleness. God may perhaps grant them repentance leading to a knowledge of the truth
Acts 17:2–4: And Paul went in, as was his custom, and on three Sabbath days he reasoned with them from the Scriptures, 3 explaining and proving that it was necessary for the Christ to suffer and to rise from the dead, and saying, “This Jesus, whom I proclaim to you, is the Christ.” 4 And some of them were persuaded and joined Paul and Silas, as did a great many of the devout Greeks and not a few of the leading women
Luke 1:3: it seemed good to me also, having followed all things closely for some time past, to write an orderly account for you, most excellent Theophilus
John 20:30–31: 30 Now Jesus did many other signs in the presence of the disciples, which are not written in this book; 31 but these are written so that you may believe that Jesus is the Christ, the Son of God, and that by believing you may have life in his name
John 21:24: This is the disciple who is bearing witness about these things, and who has written these things, and we know that his testimony is true
Alright, here is an eleventh:
Proverbs 15:23: To make an apt answer is a joy to a man, and a word in season, how good it is!
All passages are from the English Standard Version