For the source text click/tap here: Bechorot 30
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Beginning with the Mishna on our daf we turn our attention to questions of whether someone who is suspect about one area of law is suspect about other areas of law.
One who is suspect to flaunt the laws of firstborn is not trusted to buy even deer meat from him. It is likewise forbidden to buy raw hides from him, but tanned hides are permitted: since, if he were discovered, he would lose the hide, he won't put that much labor into the hide of a firstborn.
An example of the Gemara’s concern is whether someone who commits certain transgressions can be considered a ḥaver – someone who is trustworthy about tithes and issues of ritual purity.
Another example of the problem of personal integrity applies to whether acceptance of mitzvos is a critical factor of one converting to be a Jew.
What makes this sugya especially significant is the distinction it establishes between repentance as an inward transformation and repentance as the public reconstruction of trust.