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

(41) Whether We show thee (realised in thy life-time) some part of what We promise them,- or We take thy soul (to Our Mercy) (Before that),- in any case, to Us is their return: ultimately Allah is witness, to all that they do.

(42) In whatever business thou mayest be, and whatever portion thou mayest be reciting from the Qur'an,- and whatever deed ye (mankind) may be doing,- We are witnesses thereof when ye are deeply engrossed therein. Nor is hidden from thy Lord (so much as) the weight of an atom on the earth or in heaven. And not the least and not the greatest of these things but are recorded in a clear record.

(43) Can they be (like) those who accept a Clear (Sign) from their Lord, and whom a witness from Himself doth teach, as did the Book of Moses before it,- a guide and a mercy? They believe therein; but those of the Sects that reject it,- the Fire will be their promised meeting-place. Be not then in doubt thereon: for it is the truth from thy Lord: yet many among men do not believe!

(44) Who doth more wrong than those who invent a lie against Allah? They will be turned back to the presence of their Lord, and the witnesses will say, "These are the ones who lied against their Lord! Behold! the Curse of Allah is on those who do wrong!-

(45) "We say nothing but that (perhaps) some of our gods may have seized thee with imbecility." He said: "I call Allah to witness, and do ye bear witness, that I am free from the sin of ascribing, to Him,

(46) He said: "It was she that sought to seduce me - from my (true) self." And one of her household saw (this) and bore witness, (thus):- "If it be that his shirt is rent from the front, then is her tale true, and he is a liar!

(47) (Jacob) said: "Never will I send him with you until ye swear a solemn oath to me, in Allah's name, that ye will be sure to bring him back to me unless ye are yourselves hemmed in (and made powerless). And when they had sworn their solemn oath, he said: "Over all that we say, be Allah the witness and guardian!"

(48) "Turn ye back to your father, and say, 'O our father! behold! thy son committed theft! we bear witness only to what we know, and we could not well guard against the unseen!

(49) The Unbelievers say: "No messenger art thou." Say: "Enough for a witness between me and you is Allah, and such as have knowledge of the Book."

(50) One Day We shall raise from all Peoples a witness: then will no excuse be accepted from Unbelievers, nor will they receive any favours.