The Prophet of Allah, sallallaahu ‘alayhi wa sallam, rewarded those that did something good for him:

“The Prophet of Allah, sallallaahu ‘alayhi wa sallam, went out of his home at an hour that usually no one is out, and no one can be found at that hour. Abu Bakr approached him and he, sallallaahu ‘alayhi wa sallam, said: ‘What has brought you here, O Abu Bakr?’ Abu Bakr responded, ‘I went out to see the Messenger of Allah, sallallaahu ‘alayhi wa sallam, look at his face, and greet him with greetings of peace.’ It was not long before `Umar, too, came, and the Prophet of Allah, sallallaahu ‘alayhi wa sallam, said to him: ‘What brought you here, O `Umar?’ He replied: ‘Hunger, O Messenger of Allah.’ The Messenger of Allah, sallallaahu ‘alayhi wa sallam, then said: ‘I, too, am finding the same thing.’ Then they went to the home of Abu Al-Haytham ibn At-Tayyihaan Al-Ansaari, a man who possessed many date-palm trees and sheep. He had no servants, so they did not find him, but told his wife, ‘Where is your husband?’ She replied: ‘He went to find drinking water for us.’ It was not long before Abu Al-Haytham approached carrying a heavy canteen. He put it down then went to the Prophet of Allah, sallallaahu ‘alayhi wa sallam, and hugged him, then said that he would sacrifice his father and mother for him, then took them to his garden. Abu Hurayrah narrated that the Prophet of Allah, sallallaahu ‘alayhi wa sallam, said: “Do not do Tasriyah with regards to camels and goats. Whoever purchases such a camel or goat has the choice to milk it, and afterwards, can either keep it, or return it alone with a measurement of dates.”