תּוספֿתּא אויף במדבר 5:16

They do not give [the bitter waters] to two suspected adulteresses to drink at one time, so that the heart of one will not be strengthened by the other. Rabbi Yehuda says, it is not for that reason. Rather, it is because of what it says (Num. 5:16), "The Kohen shall bring her close [and stand her before Hashem]." He brings her close, and he does not bring two close.