Is ISLAM the Correct Religion?
How can I get to the highest level of Jannah (paradise)?
A person could pray all their life long, fast every day, go on every single Hajj, become rich and spend all their money (all rewarding), but life is limited/reward is limited. Muhammad salAllahu alaihi wasalam taught us that if someone who sought knowledge taught someone else, for example, how to pray, then every single time this person whom he taught prays, he would also get the reward for it (without negating from the reward of whom he taught).
“So, if I teach 100 people how to pray, and they pray all of their life, then on the Day of Judgment, my scale, if Allah wills, will have the reward of all the prayers they did (without negating from the reward of whom he taught).”