The word(s) "witness" appears 123 time(s) in 99 verse(s) in Quran in Mohsin Khan translation.

(11) O people of the Scripture! (Jews and Christians): "Why do you disbelieve in the Ayat of Allah, [the Verses about Prophet Muhammad صلى الله عليه وسلم present in the Taurat (Torah) and the Injeel (Gospel)] while you (yourselves) bear witness (to their truth)."

(12) And (remember) when Allah took the Covenant of the Prophets, saying: "Take whatever I gave you from the Book and Hikmah (understanding of the Laws of Allah), and afterwards there will come to you a Messenger (Muhammad صلى الله عليه وسلم) confirming what is with you; you must, then, believe in him and help him." Allah said: "Do you agree (to it) and will you take up My Covenant (which I conclude with you)?" They said: "We agree." He said: "Then bear witness; and I am with you among the witnesses (for this)."

(13) 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).

(14) 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?"

(15) Say: "O people of the Scripture (Jews and Christians)! Why do you stop those who have believed, from the Path of Allah, seeking to make it seem crooked, while you (yourselves) are witnesses [to Muhammad صلى الله عليه وسلم as a Messenger of Allah and Islam (Allah's religion, i.e. to worship none but Him Alone)]? And Allah is not unaware of what you do."

(16) And try orphans (as regards their intelligence) until they reach the age of marriage; if then you find sound judgement in them, release their property to them, but consume it not wastefully and hastily fearing that they should grow up, and whoever (amongst guardians) is rich, he should take no wages, but if he is poor, let him have for himself what is just and reasonable (according to his labour). And when you release their property to them, take witness in their presence; and Allah is All-Sufficient in taking account.

(17) And those of your women who commit illegal sexual intercourse, take the evidence of four witnesses from amongst you against them; and if they testify, confine them (i.e. women) to houses until death comes to them or Allah ordains for them some (other) way.

(18) And to everyone, We have appointed heirs of that (property) left by parents and relatives. To those also with whom you have made a pledge (brotherhood), give them their due portion (by Wasiyyah - will) . Truly, Allah is Ever a witness over all things.

(19) How (will it be) then, when We bring from each nation a witness and We bring you (O Muhammad صلى الله عليه وسلم) as a witness against these people?

(20) Whatever of good reaches you, is from Allah, but whatever of evil befalls you, is from yourself. And We have sent you (O Muhammad صلى الله عليه وسلم) as a Messenger to mankind, and Allah is Sufficient as a witness.