The Messenger of Allah (peace and blessings of Allah be upon him) said:

خَيْرُ النَّاسِ أَنْفَعُهُمْ لِلنَّاسِ

"The best of people are those who are most beneficial to people"
(Narrated by Ahmad, ath-Thabrani, ad-Daruqutni. This hadith was authenticated by al-Albani in Shahihul Jami', No. 3289).