Acts 21:23

Do what we tell you. We have four men who have taken a vow.

Acts 18:18

Paul stayed many days. Then he left the brothers and sailed for Syria. Also with Paul were Priscilla and Aquila. Paul clipped this hair short in Cenchreae because of a vow.

Numbers 6:2-7

Tell the Israelites: 'A man or a woman may make a special vow to live as a Nazirite dedicated to Jehovah.

Treasury of Scripture Knowledge

Summary

Do therefore this that we say to thee: We have four men which have a vow on them;

Bible References

We have

Acts 18:18
Paul stayed many days. Then he left the brothers and sailed for Syria. Also with Paul were Priscilla and Aquila. Paul clipped this hair short in Cenchreae because of a vow.
Numbers 6:2
Tell the Israelites: 'A man or a woman may make a special vow to live as a Nazirite dedicated to Jehovah.