'Necessary' in the Bible

Because of this, [it is] all the more necessary [that] we pay attention to the [things] we have heard, lest we drift away.

For every high priest is appointed in order to offer both gifts and sacrifices; therefore [it was] necessary [for] this one also to have something that he offers.

Therefore [it was] necessary [for] the sketches of the [things] in heaven to be purified with these [sacrifices], but the heavenly [things] themselves [to be purified] with better sacrifices than these.

since it would have been necessary for him to suffer many times from the foundation of the world, but now he has appeared once at the end of the ages for the removal of sin by the sacrifice of himself.