The word(s) "witness" appears 132 time(s) in 112 verse(s) in Quran in Abdullah Yusuf Ali translation.

(11) Say: "O People of the Book! come to common terms as between us and you: That we worship none but Allah; that we associate no partners with him; that we erect not, from among ourselves, Lords and patrons other than Allah." If then they turn back, say ye: "Bear witness that we (at least) are Muslims (bowing to Allah's Will).

(12) Ye People of the Book! Why reject ye the Signs of Allah, of which ye are (Yourselves) witnesses?

(13) Behold! Allah took the covenant of the prophets, saying: "I give you a Book and Wisdom; then comes to you a messenger, confirming what is with you; do ye believe in him and render him help." Allah said: "Do ye agree, and take this my Covenant as binding on you?" They said: "We agree." He said: "Then bear witness, and I am with you among the witnesses."

(14) How shall Allah Guide those who reject Faith after they accepted it and bore witness that the Messenger was true and that Clear Signs had come unto them? but Allah guides not a people unjust.

(15) Say: "O People of the Book! Why reject ye the Signs of Allah, when Allah is Himself witness to all ye do?"

(16) Say: "O ye People of the Book! Why obstruct ye those who believe, from the path of Allah, Seeking to make it crooked, while ye were yourselves witnesses (to Allah's Covenant)? but Allah is not unmindful of all that ye do."

(17) If a wound hath touched you, be sure a similar wound hath touched the others. Such days (of varying fortunes) We give to men and men by turns: that Allah may know those that believe, and that He may take to Himself from your ranks Martyr-witnesses (to Truth). And Allah loveth not those that do wrong.

(18) Make trial of orphans until they reach the age of marriage; if then ye find sound judgment in them, release their property to them; but consume it not wastefully, nor in haste against their growing up. If the guardian is well-off, Let him claim no remuneration, but if he is poor, let him have for himself what is just and reasonable. When ye release their property to them, take witnesses in their presence: But all-sufficient is Allah in taking account.

(19) If any of your women are guilty of lewdness, Take the evidence of four (Reliable) witnesses from amongst you against them; and if they testify, confine them to houses until death do claim them, or Allah ordain for them some (other) way.

(20) To (benefit) every one, We have appointed shares and heirs to property left by parents and relatives. To those, also, to whom your right hand was pledged, give their due portion. For truly Allah is witness to all things.