'Necessity' in the Bible

For the priesthood being changed, there is made of necessity a change also of the law.

who hath no necessity daily, as the chief priests, first for his own sins to offer up sacrifice, then for those of the people; for this he did once, having offered up himself;

For every high priest is ordained to offer gifts and sacrifices: wherefore it is of necessity that this man have somewhat also to offer.

For where a testament is, there must also of necessity be the death of the testator.