3 verses have
witness
in Edition Clear Qur'an by Talal Itani / Al-Anbiyaa (The Prophets)

21:56He said, “Your Lord is the Lord of the heavens and the earth, the One who created them, and I bear witness to that.

21:61They said, “Bring him before the eyes of the people, so that they may witness.”

21:78And David and Solomon, when they gave judgment in the case of the field, when some people’s sheep wandered therein by night; and We were witnesses to their judgment.