The word(s) "proof" appears 241 time(s) in 235 verse(s) in Quran in Mohsin Khan translation.

(141) They say: "Why does he not bring us a sign (proof) from his Lord?" Has there not come to them the proof of that which is (written) in the former papers [Scriptures, i.e. the Taurat (Torah), and the Injeel (Gospel), about the coming of the Prophet Muhammad صلى الله عليه وسلم]?

(142) And if We had destroyed them with a torment before this (i.e. Messenger Muhammad صلى الله عليه وسلم and the Qur'an), they would surely have said: "Our Lord! If only You had sent us a Messenger, we should certainly have followed Your Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.), before we were humiliated and disgraced."

(143) Nay, they say: "These (revelations of the Qur'an which are revealed to Muhammad صلى الله عليه وسلم) are mixed up false dreams! Nay, he has invented them! - Nay, he is a poet! Let him then bring us an Ayah (sign as a proof) like the ones (Prophets) the former were sent (with)!"

(144) Or have they taken for worship (other) alihah (gods) besides Him? Say: "Bring your proof." This (the Qur'an) is the Reminder for those with me and the Reminder for those before me. But most of them know not the Truth, so they are averse.

(145) Man is created of haste. I will show you My Ayat (torments, proofs, evidence, verses, lessons, signs, revelations, etc.). So ask Me not to hasten (them).

(146) We helped him against the people who denied Our Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.). Verily, they were a people given to evil. So We drowned them all.

(147) Thus have We sent it (this Qur'an) down (to Muhammad صلى الله عليه وسلم) as clear signs, evidence and proofs, and surely, Allah guides whom He wills.

(148) But those who strive against Our Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.), to frustrate them, they will be dwellers of the Hell-fire.

(149) Verily, in this [what We did as regards drowning of the people of Nuh (Noah)], there are indeed Ayat (proofs, evidence, lessons, signs, etc. for men to understand), for sure We are ever putting (men) to the test.

(150) Then We sent Musa (Moses) and his brother Harun‎‎ (Aaron), with Our Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) and manifest authority,