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

(21) And if they turn away (and do not accept these true proofs and evidence), then surely, Allah is All-Aware of those who do mischief.

(22) How shall Allah guide a people who disbelieved after their belief and after they bore witness that the Messenger (Muhammad صلى الله عليه وسلم) is true and after clear proofs had come unto them? And Allah guides not the people who are Zalimun (polytheists and wrong-doers).

(23) Say: "O people of the Scripture (Jews and Christians)! Why do you reject the Ayat of Allah (proofs, evidence, verses, lessons, signs, revelations, etc.) while Allah is Witness to what you do?"

(24) And hold fast, all of you together, to the Rope of Allah (i.e. this Qur'an), and be not divided among yourselves , and remember Allah's Favour on you, for you were enemies one to another but He joined your hearts together, so that, by His Grace, you became brethren (in Islamic Faith), and you were on the brink of a pit of Fire, and He saved you from it. Thus Allah makes His Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.,) clear to you, that you may be guided.

(25) And be not as those who divided and differed among themselves after the clear proofs had come to them. It is they for whom there is an awful torment.

(26) Indignity is put over them wherever they may be, except when under a covenant (of protection) from Allah, and from men; they have drawn on themselves the Wrath of Allah, and destruction is put over them. This is because they disbelieved in the Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) of Allah and killed the Prophets without right. This is because they disobeyed (Allah) and used to transgress beyond bounds (in Allah's disobedience, crimes and sins).

(27) O you who believe! Take not as (your) Bitanah (advisors, consultants, protectors, helpers, friends) those outside your religion (pagans, Jews, Christians, and hypocrites) since they will not fail to do their best to corrupt you. They desire to harm you severely. Hatred has already appeared from their mouths, but what their breasts conceal is far worse. Indeed We have made plain to you the Ayat (proofs, evidence, verses) if you understand.

(28) Then if they reject you (O Muhammad صلى الله عليه وسلم), so were Messengers rejected before you, who came with Al-Bayyinat (clear signs, proofs, evidence) and the Scripture and the Book of Enlightenment.

(29) Surely! Those who disbelieved in Our Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.), We shall burn them in Fire. As often as their skins are roasted through, We shall change them for other skins that they may taste the punishment. Truly, Allah is Ever Most Powerful, All-Wise.

(30) O you who believe! Take not for Auliya' (protectors or helpers or friends) disbelievers instead of believers. Do you wish to offer Allah a manifest proof against yourselves?