Cross reference
Acts 21:23
23 `This, therefore, do that we say to thee: We have four men having a vow on themselves,
Acts 18:18
18 And Paul having remained yet a good many days, having taken leave of the brethren, was sailing to Syria -- and with him `are' Priscilla and Aquilas -- having shorn `his' head in Cenchera, for he had a vow;
Numbers 6:2-7
2 `Speak unto the sons of Israel, and thou hast said unto them, When a man or woman doeth singularly, by vowing a vow of a Nazarite, to be separate to Jehovah;
3 from wine and strong drink he doth keep separate; vinegar of wine, and vinegar of strong drink he doth not drink, and any juice of grapes he doth not drink, and grapes moist or dry he doth not eat;
4 all days of his separation, of anything which is made of the wine-vine, from kernels even unto husk, he doth not eat.
5 `All days of the vow of his separation a razor doth not pass over his head; till the fulness of the days which he doth separate to Jehovah he is holy; grown up hath the upper part of the hair of his head.
6 `All days of his keeping separate to Jehovah, near a dead person he doth not go;
7 for his father, or for his mother, for his brother, or for his sister -- he is not unclean for them at their death, for the separation of his God `is' on his head;