Narrated Jundab bin 'Abdullah:
that the Messenger of Allah (ﷺ) said: "Whoever says (something) about the Qur'an according to his own opinion and he is correct, yet he has committed a mistake." (RU)
English reference (RU): Vol. 5, Book 44, Hadith 2952 (RU)
Arabic reference (RU): Book 47, Hadith 3206 (RU)