Reference for Ketubot 46:6

רישא וסיפא דאיכא עדים מציעתא דליכא עדים אמר אביי אין רישא וסיפא דאיכא עדים מציעתא דליכא עדים

The first clause and the last clause refer to a case when there are witnesses, [and] the middle clause when there are no witnesses? Abaye said: Yes, the first clause and the last clause refer to a case when there are witnesses, [and] the middle clause when there are no witnesses?

Jastrow

Jastrow