Nedarim 18B

מתני׳ סתם נדרים להחמיר, ופירושם להקל. כיצד? אמר ״הרי עלי כבשר מליח״ ״כיין נסך״, אם בשל שלמים נדר ⁠— אסור.

Mishnah: Unspecified vows are treated stringently, but their specification, if specification is necessary, is treated leniently. How so? If one said: This item is prohibited to me like salted meat, or: This item is prohibited to me like the wine used for libations, if he vowed in reference to meat or libations of a peace-offering, i.e., if he claimed that his intention was that the item will be forbidden to him like the salted meat of an offering, or like wine that is used for libations on the altar, it is forbidden, as he associated the item of the vow with an item forbidden by means of a vow, i.e., the offering.

אם בשל עבודה זרה נדר ⁠— מותר. ואם סתם ⁠— אסור.

If he claims that he vowed in reference to meat or libations of idol worship, i.e., that the item will be like the salted meat of an offering for an idol, or like wine that is used for libations as idol worship, it is permitted, as the item of the vow was associated with an item forbidden by the Torah. By enabling the one who took the vow to later clarify his intent, the vow is treated leniently. And if the vow was without specification, i.e., the one who took the vow did not specify whether his intention was to associate the item with an offering for Heaven or to associate the item with idol worship, it is forbidden.

״הרי עלי כחרם״, אם כחרם של שמים ⁠— אסור, ואם כחרם של כהנים ⁠— מותר. ואם סתם ⁠— אסור.

Similarly, if one said: This item is hereby forbidden to me like an item dedicated to the Temple, if his intention was that it would be like a dedication to Heaven, which is a form of consecration, it is forbidden. And if his intention was that it would be like a dedication to priests, by which one pledges his asset as a gift to priests, it is permitted, as this type of gift is not forbidden at all. And if he said it without specification, it is forbidden.