Unit 4 - Section 2: 〜ことはない
〜ことはない (no need to / it never happens that)
ことはない has two common readings: “there is no need to V” (advice) and “it is not the case that V happens” (denial of occurrence).
心配することはありません。
There is no need to worry.
毎日遅れることはない。
It is not as if I am late every day.
ことはない after a dictionary verb. 必要はない is a plainer “no need”.