Found just under twenty times in the New Testament and limited to the books of Matthew, Luke, Romans, First Corinthians, Second Corinthians, First Thessalonians, Philemon, Hebrews and Jude, the Greek noun “ananke” described what was “necessary.”  In Mt. 18:7Mt. 18:7
English: American Standard Version (1901) - ASV
7 Woe unto the world because of occasions of stumbling! for it must needs be that the occasions come; but woe to that man through whom the occasion cometh!

WP-Bible plugin Jesus said offences “must needs be.”  A man declined to attend a “great supper” (Lk. 14:16Lk. 14:16
English: American Standard Version (1901) - ASV
16 But he said unto him, A certain man made a great supper; and he bade many:

WP-Bible plugin) because he “must needs go” (Lk. 14:18Lk. 14:18
English: American Standard Version (1901) - ASV
18 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.

WP-Bible plugin) and see a field he had purchased.  Paul felt a “necessity” to preach the gospel (1 Cor. 9:161 Cor. 9:16
English: American Standard Version (1901) - ASV
16 For if I preach the gospel, I have nothing to glory of; for necessity is laid upon me; for woe is unto me, if I preach not the gospel.

WP-Bible plugin) and Jude believed he was “constrained” to write the letter that bears his name (Jude 3).