Verses with the word vow in the New Testament (2 verses):

Acts 18:18
And Paul after this tarried there yet a good while, and then took his leave of the brethren, and sailed thence into Syria, and with him Priscilla and Aquila; having shorn his head in Cenchrea: for he had a vow.

Acts 21:23
Do therefore this that we say to thee: We have four men which have a vow on them;