According to the English Standard Version (ESV) of the Bible, the qualifications of a deacon are found primarily in 1 Timothy 3:8–13. The passage provides both character and family requirements for those who serve in this role. Here is the full text, followed by a summary and key insights.

📖 1 Timothy 3:8–13 (ESV)
8 Deacons likewise must be dignified, not double-tongued, not addicted to much wine, not greedy for dishonest gain.
9 They must hold the mystery of the faith with a clear conscience.
10 And let them also be tested first; then let them serve as deacons if they prove themselves blameless.
11 Their wives likewise must be dignified, not slanderers, but sober-minded, faithful in all things.
12 Let deacons each be the husband of one wife, managing their children and their own households well.
13 For those who serve well as deacons gain a good standing for themselves and also great confidence in the faith that is in Christ Jesus.

🔍 Summary of Qualifications
Personal Character
• Dignified (v. 8): Worthy of respect; serious-minded and honorable.
• Not double-tongued (v. 8): Honest and consistent in speech; not hypocritical or deceptive.
• Not addicted to much wine (v. 8): Temperate and self-controlled.
• Not greedy for dishonest gain (v. 8): Free from the love of money or materialism.
• Holding the mystery of the faith with a clear conscience (v. 9): Strong in faith, grounded in sound doctrine, and living consistently with belief.
Testing and Reputation
• Tested first (v. 10): Their character and service should be examined before appointment.
• Proven blameless (v. 10): No valid charge of wrongdoing can be held against them.
Family Life
• Faithful wife (v. 11): Their wives (or possibly female servants, depending on interpretation) must also be dignified, not slanderers, sober-minded, and faithful in all things.
• Husband of one wife (v. 12): Faithful to his wife; morally pure.
• Managing children and household well (v. 12): Demonstrates leadership, responsibility, and godly influence in the home.