What is said when slaughtering the sacrificial animal and others

Question:
We move on to another issue among the questions this listener is asking. She asks Your Eminence: We hear that people, when slaughtering, mention Allah and say the takbir, but they do not pronounce the testimony of faith. Is it obligatory to pronounce the testimony of faith when slaughtering, or is it not obligatory?

Answer:
The Sunnah when slaughtering is: It does not require the testimony of faith, (In the name of Allah, and Allah is the Greatest), then one slaughters: The Prophet (peace and blessings be upon him), when he intended to slaughter, would say: then he would slaughter the animal. If it was a sacrificial animal, he would say: O Allah, this is for so-and-so, the son of so-and-so, or for so-and-so, which is better. Or if it was an 'aqiqah: which is ...... that is slaughtered for the newborn.
He would say: O Allah, this is for my son so-and-so, or my daughter so-and-so. There is nothing wrong with this; it is prescribed. But when slaughtering, he says: (In the name of Allah, and Allah is the Greatest), then he draws the knife across the throat of the animal, or stabs it in the chest if the animal is a camel.
He stabs it in the chest with a spear, and if it is cattle or sheep, he slaughters it on its left side, slaughtering it with a knife. Yes.

The presenter : May Allah reward you with good.