Here is a beautiful habit of the companions of the Prophet ﷺ. When two of them met and it was time to go their separate ways, they would not simply say goodbye.
Instead, one would recite Surah Al-Asr to the other, and only then would they part.
Why? Because it reminded them both, one more time: time is running out — let us keep believing, keep doing good, and keep helping each other. Try it with a friend or your brother or sister!