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Colossians 3:12-13
Therefore, as the elect of God, holy and beloved, put on tender mercies, kindness, humility, meekness, longsuffering; bearing with one another, and forgiving one another, if anyone has a complaint against another; even as Christ forgave you, so you also must do.
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Titus 3:1-2
Remind them to be subject to rulers and authorities, to obey, to be ready for every good work, to speak evil of no one, to be peaceable, gentle, showing all humility to all men.
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Ephesians 4:29-32
Let no corrupt word proceed out of your mouth, but what is good for necessary edification, that it may impart grace to the hearers. And do not grieve the Holy Spirit of God, by whom you were sealed for the day of redemption. Let all bitterness, wrath, anger, clamor, and evil speaking be put away from you, with all malice. And be kind to one another, tenderhearted, forgiving one another, even as God in Christ forgave you.
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1 Peter 3:8
Finally, all of you be of one mind, having compassion for one another; love as brothers, be tenderhearted, be courteous;
Related Scriptures
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Luke 6:31
And just as you want men to do to you, you also do to them likewise.
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Philippians 2:3-4
Let nothing be done through selfish ambition or conceit, but in lowliness of mind let each esteem others better than himself. Let each of you look out not only for his own interests, but also for the interests of others.
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Titus 3:3
For we ourselves were also once foolish, disobedient, deceived, serving various lusts and pleasures, living in malice and envy, hateful and hating one another.
For more scripture references, please see Bible verses for Courtesy
Resources

Courtesy
'Ready Answer' by Mike FordThese days, everyone demands respect but few are willing to grant it. It is a rare event when someone gives up his seat or when a child shows deference.
Courtesy
Sermonette by Mike FordGod's word has much to say about politeness and rudeness. A Christian who is taught to put others first will have little difficulty being courteous.
Perfect, Gentle Courtesy (Part 2)
Sermon by Martin G. CollinsGood manners are not just an accomplishment, but a duty that everyone must practice in order for society to move smoothly.
Perfect, Gentle Courtesy (Part 3)
Sermon by Martin G. CollinsParents are obligated to teach God's laws to their children. According to Emily Post, good manners are to the family what good morals are to society.
Perfect, Gentle Courtesy (Part 1)
Sermon by Martin G. CollinsOur manners express our personality, especially as they portray humility, courtesy, or gentleness, and are improved as we make use of God's Spirit.
Civility and Courtesy
Sermon by Richard T. RitenbaughSocietal incivility, discourtesy, and in-your-face attitudes (works of the flesh) have manifested themselves in the church of God, but contradict agape.

Displaying Gentle and Patient Conduct
Sermon by Martin G. CollinsGod's people must follow the spirit of the law regarding the treatment of others, being humble, sincere, and gentle, esteeming others before themselves.

Displaying Virtuous Character
Sermon by Martin G. CollinsSelf-control has both an inward and outward dimension, the latter concerned with human relationships, manners, and reflecting God's orderly mindset.
For more resources, please see the library topic for Courtesy