The scholar, the ruler, and your brother
It is reported that ‘Abdullāh b. Al-Mubārak – Allāh have mercy on him – said:
It is right that an intelligent person does not undervalue three [types of people]: the scholars, the rulers, and [his Muslim] brothers. Whoever undervalues the scholars will lose his afterlife, whoever undervalues the rulers will lose his worldly life, and whoever undervalues his brothers loses his good character and conduct. Al-Dhahabī, Siyar A’lām Al-Nubalā`17:251.
Al-Dhahabī, Siyar A’lām Al-Nubalā`17:251.
Also read
Related sayings.
As per general repect to elders, the Salaf would let someone who is older enter first, contrary to common practice today.
Some of the most important things that benefit us, and without which, a person is of no benefit.