"But did We not grant you life enough for whoever would remember therein to remember, and the warner had come to you?" (Quran 35: 37).
Some scholars said that the meaning of a Warner here is getting grey-haired with age, which is a sign of Allah's mercy. For example, it is merciful to remind the student of the approaching test, or the traveler of the departure time. In our times, a new warner has come, here we tell you about it.