Acts 18:1

(1) There can be no doubt that the “vow” was that of the temporary Nazarite, as described in Numbers 6:1-21. It implied a separation from the world and common life (this was the meaning of the word “Nazarite”), and while under the vow the man who had taken it was to drink no wine or strong drink, and to let no razor pass over his head or face. When the term was completed, he was to shave his head at the door of the Tabernacle, and burn the hair in the fire of the altar. It will be noted that the Nazarites in Acts 21:24, who are completing their vow, shave their heads. Here a different word (“shorn”) is used, which is contrasted with “shaving” in 1 Corinthians 11:6. It was lawful for a man to have his hair cut or cropped during the continuance of the vow, and this apparently was what St. Paul now did. But in this case also the hair so cut off was to be taken to the Temple and burnt there, and this explains the Apostle’s eagerness “by all means” (Acts 18:21) to keep the coming feast at Jerusalem.