'Custom' in the Bible

And certain having come down from Judea, were teaching the brethren -- 'If ye be not circumcised after the custom of Moses, ye are not able to be saved;'

and according to the custom of Paul, he went in unto them, and for three sabbaths he was reasoning with them from the Writings,

unto whom I answered, that it is not a custom of Romans to make a favour of any man to die, before that he who is accused may have the accusers face to face, and may receive place of defence in regard to the charge laid against him.