'Witnesses' in the Bible

Boaz said to the elders, and to all the people, "You are witnesses this day, that I have bought all that was Elimelech's, and all that was Chilion's and Mahlon's, from the hand of Naomi.

Moreover Ruth the Moabitess, the wife of Mahlon, I have purchased to be my wife, to raise up the name of the dead on his inheritance, that the name of the dead not be cut off from among his brothers, and from the gate of his place. You are witnesses this day."

All the people who were in the gate, and the elders, said, "We are witnesses. May Yahweh make the woman who has come into your house like Rachel and like Leah, which two built the house of Israel; and treat you worthily in Ephrathah, and be famous in Bethlehem.