Ruth 4:2

And he took ten men of the elders of the city, and said, Sit ye down here. And they sat down. And he took ten men of the elders of the city, and said, Sit ye down here. And they sat down.

Ten men of the elders of the city-as witnesses. In ordinary circumstances two or three were sufficient to attest a bargain; but in cases of importance, such as matrimony, divorce, conveyancing of property, it was the Jewish practice to have ten (1 Kings 21:8).