Many religions have the belief that humans have a spiritual existence beyond physical death, and that the actions we take in this life will determine our fate in the hereafter. In this context, "spreading humanity for the hereafter" could be interpreted as doing good deeds and helping others in order to increase one's chances of a positive afterlife.

For example, in Islam, the concept of "Sadaqah Jariyah" refers to ongoing charity or good deeds that continue to benefit people after the individual who performed them has passed away. This could include things like building a well or a lighting the mosque with solar, which will continue to serve people and earn rewards for the individual in the afterlife.

Similarly, in Buddhism, the concept of "merit" refers to the positive energy created by good deeds, which can bring good fortune and positive circumstances in this life and in future lives. This could include things like donating to charity or helping others in need.

In Christianity, spreading humanity for the hereafter could involve acts of kindness and love towards others, as Jesus taught that such actions are equivalent to serving God.

Overall, the idea of spreading humanity for the hereafter can be seen as a way to live a meaningful and purposeful life, and to leave a positive legacy that will continue to benefit others even after we are gone.