One who makes the unlawful lawful, makes the lawful unlawful, or abandons the Sunnah

Sayyidah Aishah Siddiqah (may Allah be pleased with her) narrates: The Prophet (peace and blessings be upon him) said: "There are six people whom I have cursed, and whom Allah Almighty and every prophet whose supplications are answered have cursed: the one who adds to the Book of Allah; the one who denies the decree of Allah; the one who makes lawful what Allah Almighty has made sacred; the one who makes lawful, with regard to my family ('itrah), what Allah Almighty has forbidden; and the one who abandons the Sunnah."
Al-Tabarani recorded it in al-Mu'jam al-Kabir; its chain contains a narrator, Ubaydullah bin Abd al-Rahman bin Mawhab, about whom Ya'qub bin Shaybah said: There is weakness in him. According to one report Yahya bin Ma'in declared him da'if (weak), and according to another he declared him thiqah (trustworthy). Abu Hatim said: He is salih al-hadith (acceptable in hadith). Ibn Hibban declared him thiqah (trustworthy). Its narrators are the narrators of the Sahih.

Sayyiduna Amr bin Shaghwa al-Yafi'i (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) said: "There are seven people whom I and every prophet whose supplications are answered have cursed: the one who adds to the Book of Allah Almighty; the one who denies the decree ordained by Allah Almighty; the one who makes lawful what Allah Almighty has made sacred; the one who makes lawful, with regard to my family ('itrah), what Allah Almighty has forbidden; the one who abandons my Sunnah; the one who shows favouritism with the fay' wealth; and the one who acts tyrannically through his authority in order to honour the one whom Allah Almighty has disgraced and disgrace the one whom Allah Almighty has honoured."
Al-Tabarani recorded it in al-Mu'jam al-Kabir; its chain contains a narrator, Ibn Lahi'ah, who is da'if (weak), and a narrator, Abu Ma'shar al-Himyari, whom I have not seen anyone mention.

Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates that he heard the Prophet (peace and blessings be upon him) say: "The one who makes a lawful thing unlawful is like the one who makes the unlawful lawful."
Al-Tabarani recorded it in al-Mu'jam al-Awsat, and its narrators are the narrators of the Sahih.

Umm Ma'bad, the freedwoman of Qarazah bin Ka'b, said: O my son, the one who makes unlawful what Allah Almighty has made lawful is like the one who makes lawful what Allah Almighty has made unlawful.
Al-Tabarani recorded it in al-Mu'jam al-Kabir, and its chain is such that I have not seen anyone mention most of its narrators.

Sayyiduna Abdah al-Suwa'i narrates: Some people were making a commotion near the Prophet (peace and blessings be upon him). His (peace and blessings be upon him) Companions said: O Messenger of Allah, if you were to send someone to these people to stop them from this behaviour (it would be appropriate). The Prophet (peace and blessings be upon him) said: If I were to send word to them and forbid them from going to al-Hajun, some of them would go there, even if he had no business there.
Al-Tabarani recorded it, and its narrators are the narrators of the Sahih.

Sayyiduna Abu Juhayfah (may Allah be pleased with him) narrates: Once the Prophet (peace and blessings be upon him) was seated, and in front of him were some people doing things that displeased him: their talk and their commotion (displeased him). It was said: O Messenger of Allah, why do you not forbid them? The Prophet (peace and blessings be upon him) said: If I were to forbid them from going to al-Hajun, one of them would go there, even if he had no business there.
Al-Tabarani recorded it, and its narrators are the narrators of the Sahih.

Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: Soon a man will say: Indeed Allah Almighty has commanded this and forbidden that, and Allah Almighty will say to him: You have lied. Or that man will say: Indeed Allah Almighty has made this unlawful and has made that lawful, and Allah Almighty will say to him: You have lied.
Al-Tabarani recorded it in al-Mu'jam al-Kabir, and its chain contains a narrator who has not been named.

Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: Indeed, the one who makes a lawful thing unlawful is like the one who makes an unlawful thing lawful.
Al-Tabarani recorded it in al-Mu'jam al-Kabir, and its narrators are the narrators of the Sahih. It also has other routes, which will come in the Book of Hunting.

Sayyiduna Suhayb (may Allah be pleased with him) narrates: I heard the Prophet (peace and blessings be upon him) say: "The one who makes lawful what the Qur'an has made unlawful does not believe in the Qur'an."
Al-Tabarani recorded it in al-Mu'jam al-Kabir; its chain contains a narrator, Muhammad bin Yazid bin Sinan al-Ruhawi, whom Imam Bukhari (may Allah have mercy on him) and others declared da'if (weak), while Ibn Hibban mentioned him in Kitab al-Thiqat. His father Yazid was declared da'if (weak) by Imam Abu Dawud and others, and Imam Bukhari (may Allah have mercy on him) said: He is "muqarib al-hadith" (fairly acceptable in hadith).