Sotah 6:1-2

Sotah 6:1

If a man warned his wife and she secluded herself with another man, even if he heard about it from an unreliable source (literally, “a flying bird”), he must divorce her and pay her the value of her kesubah; this is the opinion of Rabbi Eliezer. Rabbi Yehoshua says that the husband takes no action until the incident has become a topic of discussion among the women who spin thread by the light of the moon.

Sotah 6:2

If even one witness says he saw her commit adultery, she does not drink the bitter water (but is divorced without receiving the value of her kesubah). Not only that, even a male or female servant’s testimony is sufficient to keep her from receiving the value of her kesubah. The testimony of her mother-in-law, her mother-in-law’s daughter, her rival wife, her sister-in-law and her step-daughter are all believed to keep her from drinking the bitter water but not to cost her the value of her kesubah.