'Accustomed' in the Bible

But Moses said, “It is not right [or even possible] to do that, for we will sacrifice to the Lord our God what is repulsive and unacceptable to the Egyptians [that is, animals that the Egyptians consider sacred]. If we sacrifice what is repulsive and unacceptable to the Egyptians, will they not riot and stone us?

and if the ox is one accustomed to gore heretofore, and it hath been testified to its owner, and he doth not watch it, and it hath put to death a man or woman, the ox is stoned, and its owner also is put to death.

or, it hath been known that the ox is one accustomed to gore heretofore, and its owner doth not watch it, he certainly repayeth ox for ox, and the dead is his.