Midrash for Bekhorot 91:4
וה"מ לדבר הרשות אבל לדבר מצוה יש לו הפרה
a case in point being that of a teacher whom R'Aha prohibited by vow from teaching any longer because he maltreated the children, but whom Rabina reinstated, as there was not to be found one who taught so efficiently.
Sifrei Devarim
"… over the face of the son of the hated one": We are hereby taught that if his head or most of it emerged live (from the womb), he negates the next birth as a first-born.
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