Al-Imam Ali (p.b.u.h), said:

Hadith n. 62
62. Amir al-mu’minin, peace be upon him, said: If you are met with a greeting, give better greetings in return. If a hand of help is extended to you, do a better favour in return, although the credit would remain with the one who was first.

Hadith n. 63
63. Amir al-mu’minin, peace be upon him, said: The interceder is the wing of the seeker.

Hadith n. 64
64. Amir al-mu’minin, peace be upon him, said: The people of the world are like travellers who are being carried while they are asleep.

Source: https://www.al-islam.org/nahjul-balagha-part-2-letters-and-sayings