Rashi (in the first edition) and Targum Yonasan: It implies that the Nedarim of a Katan, do not take effect ¹ (unless he is twelve years old and knows in whose Name he is declaring the Nedarim - Sifri). ²

Nedarim and Yerushalmi Nedarim, 2:1, 13a: It teaches us that a Neder takes effect through Hatfasah (declaring an object forbidden like a forbidden object) via a Davar ha'Nadur (something that can become forbidden via a Neder), but not via a Davar ha'Asur (something that is already forbidden, ¹ including a B'chor.

Yerushalmi Nedarim, 1:5: To teach us that Kinuyei Nedarim - Leshonos of Nedarim which are declared by people who cannot articulate the words correctly ² - take effect like Nedarim.

To confine Nedarim to where one is Matfis on a Davar ha'Nadur - to prteclude a Davar ha'Asur.

Ramban: To teach us that a Neder takes effect even to negate a Mitzvah ¹ - for example where he declares 'Konem Sukah she'Ani Oseh' ² ... 'Lulav she'Ani Notel' ... 'Tefilin she'Ani Mani'ach'. ³

Nedarim, 13a: To include a Neder that one is Matfis on a Chatas or an Asham, which the owner designates, even though bringing them is obligatory.

Yerushalmi Nedarim, 1:1: To teach us that Kinuyei Shevuos ¹ take effect like Shevu'os. ²

Nedarim 2b: A Neder entails forbidding an object on oneself, a Shevu'ah, forbidding oneself on the object. ¹

Rashi, Ramban, Targum Onkelos and Targum Yonasan: It means to render forbidden something that is permitted.

Yerushalmi Nedarim, 9:5: It means to bind oneself. ¹

Sifri: "Isar" is a Lashon Shevu'ah - as implied in Pasuk 11. ²

Rashi, Ramban and Targum Yonasan: It implies that a Shevu'ah ¹ that forbids what is permitted takes effect, but not one that permits what is forbidden - such as Neveilos, T'reifos, Shekatzim and Remasim.

Nedarim, 12a: "Le'esor Isar" implies that the Shevu'ah takes effect if one attatches the Shevu'ah to an Isur, and "al Nafsho", even where he says 'Hareini she'Lo Ochal Basar ve'she'Lo Eshteh Yayin ke'Yom she'Meis bo Avi' or 'ke'Yom she'Meis bo Rebbi' or ke'Yom she'Ra'isi es Yerushalayim be'Churbanah', ² or where he says ke'Yom she'Neherag bo Gedalysh ben Achikam'. ³

Yerushalmi Nedarim, 1:5: It implies that his words take effect evern if he declared a Neder with a Lashon Shevu'ah or a Shevu'ah with a Lashon Neder - whether he declared 'Harei Hu alai' (Neder) or Harei Ani alav' (Shevu'ah). ⁴

Nazir, 62b: It implies that the Noder has jurisdiction over himself - to preclude an Eved Cana'ani, who is subservient to his master, and whose Nedarim his master therefore has the right to negate any Nedarim that interfere with his work. ¹

Sifri: It implies that a Neder takes effect even be'Machshavah, where the Noder did not verbalize his Neder or his Shevu'ah. ²

Oznayim la'Torah #1 (citing the Tanchuma): To teach us the depth (the severity) of a Shevu'ah - the transgression of which is akin to denying Hakadosh-Baruch-Hu and is therefore not subject to forgiveness, ever.

Oznayim la'Torah #2: To teach us that, as opposed to Neder, which places an Isur on the object (Isur Cheftza), a Shevu'ah places the Isur on the person (Isur Gavra). ³

Rashi #1 and Targum Yonasan: It means that one may not render one's words profane (by violating his Neder - Gur Aryeh).

Rashi #2 (in Ta?anis, 7a) and Targum Onkelos: It means that one may not negate one's words.

Ramban (in Pasuk 2, citing Chagigah, 10a) and Targum Yonasan: It hints ¹ that the Noder may not annul his Nedarim, ² but that a Chacham may ³ (This is the only source - by way of a hint - of Hataras Nedarim in the Torah).

Rashbam: With reference to a Neder ⁴ of a Korban, it means that one may not delay ⁵ the fulfillment of one's Neder until after the Yamim-Tovim. ⁶ 5. Nedarim, 16b: "Devaro" implies that one may not violate a Neder that affects one's personal issues, but not one that effects Cheftzei Shamayim - because a Shevu'ah ⁷ cannot negate a Mitzvah. ⁸

Nedarim, 80a: It implies that a Chacham is not permitted to annul a Neder before it has taken effect ⁹ (even though it has already been declared).

Nazir, 38: "Lo Yachel Devaro" incorporates a prohibition against a Nazir violating his Nezirus. ¹⁰

Shevu'os, 20b: It incorporates Konamos. ¹¹

Shevu'os, 21a: "Lo Yachel Devaro" applies to the future 'Ochal', ve'Lo Achal, ¹² whereas 'Achalti' (past), ve'Lo Achal, transgresses 've'Lo Sishav'u bi'Shemi la'Shaker'. ¹³

Tosefta, Nedarim, 4:4: "Lo Yachel ... " incorporates declaring a Neder that one is permitted to negate ¹⁴ with the intention of negating it. 11: Nedarim, 14b: The following are subject to "Lo Yachel Devaro": a. Someone who declares 'Konem she'Ani Yashen', she'Ani Medaber or she'Ani Mehalech'; ¹⁵ b. Someone who says to his wife 'Konem she'Eini Meshamshech' ('Hana'as Tashmishech alai'). ¹⁶

Nedarim 15a: It incorporates a prohibition a.against permitting Isurim that are basically permitted but which some people forbade upon themselves; ¹⁷

Rashbam: With reference to "O Hishava Shevu'ah", it means that he is obligated to adhere to the details and the time-period that he stipulated when he declared the Shevu'ah. ¹

Nedarim, 3b: It teaches us that Yados Nedarim - where the Noder omits a key word that he obviously had in mind ¹ - are like Nedarim.

Yerushalmi Nedarim, 1:5: The word "ke'Chol" implies that if part of a Neder is annnuled, the whole Neder is annuled. ²

Yerushalmi Nedarim, 2:2: "mi'Piv", 've'Lo mi'Pi Shamayim'. This teaches us that one cannot make a Shevu'ah to negate a Mitzvah. ³