King James Version
And verily they that are of the sons of Levi, who receive the office of the priesthood, have a commandment to take tithes of the people according to the law, that is, of their brethren, though they come out of the loins of Abraham:New International Version
Now the law requires the descendants of Levi who become priests to collect a tenth from the people--that is, their brothers--even though their brothers are descended from Abraham.Catholic Public Domain Version
And indeed, those who are from the sons of Levi, having received the priesthood, hold a commandment to take tithes from the people in accord with the law, that is, from their brothers, even though they also went forth from the loins of Abraham