Reference for Chullin 127:16

שמנה ספיקות הן ליבדוק בביצים דידהו

To teach the following: If both ends [of the egg] were broad, or both narrow, or if the yolk was outside and the white in the center, it is certainly unclean; if, however, one end was broad and the other narrow, and the white outside and the yolk in the center, and if, in addition, the gentile says.'

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