'Necessary' in the Bible

Only the Levites shall perform the service of the Tent of Meeting (tabernacle), and they shall bear their iniquity; it shall be a statute forever throughout your generations, that the Levites shall have no inheritance [of land] among the children of Israel.

and give to my son Solomon a perfect heart to keep Your commandments, Your testimonies, and Your statutes, and to do all [that is necessary] to build the temple [for You], for which I have made provision.”

“I have not departed from the commandment of His lips;I have kept the words of His mouth more than my necessary food.

But when he is found, he must repay seven times [what he stole];He must give all the property of his house [if necessary to meet his fine].

For you will not go out in a hurry [as when you left Egypt],Nor will you go in flight [fleeing, as you did from the Egyptians];For the Lord will go before you,And the God of Israel will be your rear guard.

“Leave your orphans behind; I will [do what is needed to] keep them alive.And let [those who are] your widows trust and confide in Me.”

Shadrach, Meshach, and Abed-nego answered the king, “O Nebuchadnezzar, we do not need to answer you on this point.

Draw water for a [long, continued] siege!Strengthen your fortresses!Go down to the clay pits, trample the mortar!Prepare the brick kiln [to burn bricks for the rampart]!