Ameerul Momineen (AS) said to Jabir bin Abdullah Ansari:
O' Jabir! The mainstay of religion and world are four persons:
1. The scholar who acts on his knowledge,
2. The ignorant who does not feel ashamed of learning,
3. The generous who is not niggardly in his favours and
4. The destitute who does not sell his next life for his worldly benefits.
Consequently, when the scholar would waste his knowledge, the ignorant would feel shame in learning;
And when the generous would be niggardly with his favours, the destitute would sell his next life for the worldly benefits.
O' Jabir! If favours of Allah abound on a person, the people's needs towards him also abound.
Therefore he who fulfils for Allah all that is obligatory on him in this regard, would be sending them for his everlasting life while he who does not fulfill those obligations, would be exposing them to decay and destruction.