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

(51) And (remember) when We told you: "Verily! Your Lord has encompassed mankind (i.e. they are in His Grip)." And We made not the vision which we showed you (O Muhammad as an actual eye-witness and not as a dream on the night of Al-Isra' ) but a trial for mankind, and (likewise) the accursed tree (Zaqqum, mentioned) in the Qur'an. We warn and make them afraid but it only increases them in naught save great disbelief, oppression and disobedience to Allah.

(52) Perform As-Salat (Iqamat-as-Salat) from mid-day till the darkness of the night (i.e. the Zuhr, 'Asr, Maghrib and 'Isha' prayers), and recite the Qur'an in the early dawn (i.e. the morning prayer). Verily, the recitation of the Qur'an in the early dawn is ever witnessed (attended by the angels in charge of mankind of the day and the night) .

(53) Say: "Sufficient is Allah for a witness between me and you. Verily He is Ever the All-Knower, the All-Seer of His slaves."

(54) I (Allah) made them (Iblis and his offspring) not to witness (nor took their help in) the creation of the heavens and the earth and not (even) their own creation, nor was I (Allah) to take the misleaders as helpers.

(55) Then the sects differed [i.e. the Christians about 'Îsa (Jesus) عليه السلام], so woe unto the disbelievers [those who gave false witness by saying that 'Îsa (Jesus) is the son of Allah] from the Meeting of a great Day (i.e. the Day of Resurrection, when they will be thrown in the blazing Fire) .

(56) "Then verily, we can produce magic the like thereof; so appoint a meeting between us and you, which neither we nor you shall fail to keep, in an open place where both shall have a just and equal chance (and beholders could witness the competition)."

(57) He said: "Nay, your Lord is the Lord of the heavens and the earth, Who created them and to that I am one of the witnesses.

(58) And (remember) Dawud (David) and Sulaiman (Solomon), when they gave judgement in the case of the field in which the sheep of certain people had pastured at night; and We were witness to their judgement.

(59) Verily, those who believe (in Allah and in His Messenger Muhammad صلى الله عليه وسلم), and those who are Jews, and the Sabians, and the Christians, and the Majus, and those who worship others besides Allah, truly, Allah will judge between them on the Day of Resurrection. Verily! Allah is over all things a witness.

(60) That they may witness things that are of benefit to them (i.e. reward of Hajj in the Hereafter, and also some worldly gain from trade), and mention the Name of Allah on appointed days (i.e. 10th, 11th, 12th, and 13th day of Dhul-Hijjah), over the beast of cattle that He has provided for them (for sacrifice), [at the time of their slaughtering by saying: (Bismillah, Wallahu-Akbar, Allahumma Minka wa Ilaik).] Then eat thereof and feed therewith the poor having a hard time.