'Needs' in the Bible

And they all with one consent began to make excuse. The first said unto him, I have bought a field, and I must needs go out and see it; I pray thee have me excused.

And when ye shall hear of wars and tumults, be not terrified: for these things must needs come to pass first; but the end is not immediately.

Now he must needs release unto them at the feast one prisoner.

And he said unto them, These are my words which I spake unto you, while I was yet with you, that all things must needs be fulfilled, which are written in the law of Moses, and the prophets, and the psalms, concerning me.