'Witnesses' in the Bible

Then Boaz said to the responsible men and to all the people, You are witnesses today that I have taken at a price from Naomi all the property which was Elimelech's, and everything which was Chilion's and Mahlon's.

And, further, I have taken Ruth, the Moabitess, who was the wife of Mahlon, to be my wife, to keep the name of the dead man living in his heritage, so that his name may not be cut off from among his countrymen, and from the memory of his town: you are witnesses this day.

And all the people who were in the public place, and the responsible men, said, We are witnesses. May the Lord make this woman, who is about to come into your house, like Rachel and Leah, which two were the builders of the house of Israel: and may you have wealth in Ephrathah, and be great in Beth-lehem;