Acts 21:23

Do therefore what we tell you. We have four men who are under a vow;

Acts 18:18

After this, Paul stayed many days longer and then took leave of the brothers and set sail for Syria, and with him Priscilla and Aquila. At Cenchreae he had cut his hair, for he was under a vow.

Numbers 6:2-7

"Speak to the people of Israel and say to them, When either a man or a woman makes a special vow, the vow of a Nazirite,to separate himself to the LORD,

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
After this, Paul stayed many days longer and then took leave of the brothers and set sail for Syria, and with him Priscilla and Aquila. At Cenchreae he had cut his hair, for he was under a vow.
Numbers 6:2
"Speak to the people of Israel and say to them, When either a man or a woman makes a special vow, the vow of a Nazirite,to separate himself to the LORD,

The Holy Bible, English Standard Version® copyright © 2001 by Crossway Bibles, a publishing ministry of Good News Publishers.