Menachos 13:11

The Torah uses the expression “a fire offering of pleasant aroma” to describe burnt offerings of cattle (Leviticus 1:9), of birds (verse 17), and flour offerings (2:2). This is to teach us that it makes no difference whether a person offers a lot or a little so long as he has proper intentions to serve God.

Chulin:1:1

Anyone may slaughter an animal for food, and their slaughter is valid, except for a person with congenital deafness, a person lacking mental competence and a minor. This is out of concern that they might ruin the slaughtering but if any of these slaughtered while under supervision, then the slaughtering is valid. Ritual slaughter performed by a non-Jew is neveila (like an animal that dies without slaughter); accordingly, it transmits ritual impurity through carrying. If a person slaughtered in the dark, or if a blind person slaughtered an animal, it is valid. If someone slaughtered (unwittingly) on Shabbos or Yom Kippur, even though doing so intentionally is a capital offense, the slaughtering is valid.