Beitza 28 - 34
“It is preferred that they will be (transgressing) unintentionally rather than being intentional transgressors.”
The gemara teaches to apply this principle and not rebuke another person who is transgressing without being aware that the act is forbidden — if you know that the doer will transgress even if he is made aware of the transgression.
In practice there are other factors that important to consider, and for the halachic parameters of this teaching see Shulchan Aruch Orach Chaim 608 and the poskim there (and ask your Rabbi in any actual halachic matter as always).
- Beitza 30a
"Whoever is merciful to others is clearly a descendant of Avraham Avinu, and whoever is not merciful to others is clearly not be a descendant of Avraham Avinu."
The Sage Shabbatai ben Marinus taught this on our daf, and derives it from a verse in Sefer Devarim (13:18). Rashi clarifies that it means “descended from the Avot” as is stated in this verse, “G-d will give you (the attribute of) mercy as He swore to your forefathers.”
- Beitza 32b