—matters that would consume almost half one’s time, for a single hour could not possibly contain eighty rakʿahs unless each consisted of al-Fātiḥah alone and was performed without composure. ʿAlī—may Allah honor his countenance—is far above praying the way hypocrites do, pecking hurriedly and remembering Allah only a little, as is related in the two Ṣaḥīḥs.”
From al-Muntaqā min Minhāj al-Iʿtidāl (pp. 169–170).

Reflect, then, on how he absolved ʿAlī, may Allah be pleased with him, of adding anything to the Prophet’s Sunnah when he said, “ʿAlī was more knowledgeable of his Sunnah and more devoted to his guidance than to diverge from him in this way.”

Among the scholars who rejected any addition:
Hence we say: had it been reliably established that more than eleven rakʿahs of the night prayer were performed by any of the Rightly Guided Caliphs—or by any other jurist among the Companions—we would have been duty-bound to regard it as permissible, given their excellence, learning, distance from innovation, and zeal in warning the people against it. But since no sound report to that effect has reached us, as has already been explained, we do not deem the increase allowable. Preceding us in this view are eminent imams, foremost Imam Mālik in one of the two opinions narrated from him. Al-Suyūṭī states in Al-Maṣābīḥ fī Ṣalāt al-Tarāwīḥ (2/77 of his Fatwas):

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