All the substitutes for vows have the validity of vows. If one says, “I shall be [one]” he is a nazirite. “I shall be comely”, he is a nazirite. “A nazik”, “a naziah”, “a paziah”, he is a nazirite. [If one says,] “Behold I shall be like this one,” or “Behold I shall curl [my hair]” or “Behold, I shall tend [my hair]” or “Behold, I shall grow my hair long,” he is a nazirite. [If one says] “Behold, I shall [bring] birds [as offerings]” Rabbi Meir says he is a nazirite, but the sages say he is not a nazirite.

[If one says,] “Behold I am a nazir [to abstain] from grape seeds, or from grape skins, or from shaving, or from [contracting] ritual defilement,” he is a nazirite and all the regulations of naziriteship apply to him. [If one says,] “Behold, I shall be like Samson”, “like the son of Manoah”, “like the husband of Delilah, or “like the one who uprooted the doors of Gaza,” or “like the one whose eyes the Philistines put out,” he is a nazirite like Samson. What difference is there between a nazirite like Samson and a life-nazirite? A life-nazirite if his hair becomes burdensome, he may thin it with a razor and then offer three animal sacrifices. If he should he be ritually defiled, he must offer the sacrifice [prescribed] for defilement. The nazirite like Samson if his hair becomes burdensome, he may not thin it. And if he becomes ritually defiled, he does not offer the sacrifice [prescribed] for defilement.

A nazirite vow of unspecified duration is for thirty days. If one says, “Behold, I am a nazirite for one long [period”], or “Behold, I am a nazirite for one short [period]”, or even [if he says, “[Behold, I am a nazirite for as long as it takes to go] from here to the end of the earth,” he is a nazirite for thirty days. [If one says,] “Behold, I am a nazirite, plus one day,” or “Behold, I am a nazirite, plus one hour,” or “Behold, I am a nazirite, once and a half,” he becomes a nazirite for two [periods of naziriteship]. [If one says,] “Behold, I am a nazirite for thirty days plus an hour,” he becomes a nazirite for thirty-one days, since there is no naziriteship for hours.

[If one says,] “Behold, I am a nazirite as the hairs of my head”, or “As the dust of the earth”, or “As the sands of the sea,” he becomes a life-nazirite, and shaves his head every thirty days. Rabbi says: this one does not shave his head every thirty days. The one who shave his head every thirty days is the one who says, “Behold, upon me are naziriteships as the hair on my head”, or “As the dust of the earth”, or “As the sands of the sea.”

[If he says,] “Behold, I am a nazirite as the capacity of this house”, or “as the capacity of this basket,” we check him. If he says “I vowed one long period of naziriteship”, he becomes a nazirite for thirty days. But if he says “I vowed without specification”, we regard the basket as though it were full of mustard seed, and he becomes a nazirite for life.

[If one says], “Behold I am a nazirite, as the number of days in a solar year” he must count as many naziriteships as there are days in the solar year. Rabbi Judah said: such a case once occurred, and when the man had completed [his naziriteships], he died.