For children, - Islam: Death is a Beautiful Gift for a Believer and this worldly life is a preparation for Hereafter

According to an old fable, a man made an unusual agreement with Hazrat
Izraeel (pbuh) - the angel of death. He told Hazrat Izraeel (pbuh)
that he would be willing to accompany him (as though he had a choice)
only if Hazrat Izraeel (pbuh) would send him a notice well in advance.
The agreement was made. Weeks became months and the months into years.
One bitterly cold night, as the man sat alone thinking of his success
in life, Hazrat Izraeel (pbuh) tapped on his shoulder. "You are here
too soon" the man cried out. "You sent no messenger. I thought we had
an agreement!" Hazrat Izraeel (pbuh) whispered "Notice your hair, once
it was full and black, now it has streaks of silver in it! Observe
your face in the mirror and see the wrinkles. Yes! I have sent many
messages through the years! I have kept my part. I am sorry that you
are not ready for me but the order of Almighty Allah (SWT) cannot be
averted!"
Prophet of Islam, Muhammad (pbuh) said: You are not created for
annihilation and mortality, but you have been created for survival and
eternal living, and it is only by death that you are transferred from
this lodging to other housing.
The King and the Poor Man are equal after Death in this World:
There was a king who decided to take a tour of his country. As he
passed by different places, everyone rushed to see him. However, while
passing by a certain place, he noticed a poor old man who did not pay
any attention to the king's arrival and remained engaged in his own
activities.
The king went up to this poor man and asked why he did not join the
people to see him. The poor man replied, "Before you, there was
another king who once passed by this place. Everyone gathered to see
him as well. But, few days later he died and was buried in a place
nearby. A poor man also died during that time and was buried near the
king's grave. After some time, a strong flood passed through that area
causing those graves to overturn. As a result, the bones of the poor
man became mixed up with those of the king's. We could not
differentiate between them any longer. After seeing this, it does not
matter to me anymore as to who is a king and who is a beggar. In the
end, our home is the same."
Imam Zein elabdin (as)said: The world and its affairs will seem
insignificant for the one with great and cleric personality.
Imam Muhammad Bagher (as)said: To recognize the world insignificant is
the highest stage of certainty in faith.
The Hereafter - Ma'ad by Ayatullah Dastghaib Shiraazi (q.s.)