In the Holy Qur'an

And spend in the way of Allah and cast not yourselves to perfition with your own hands, and do good (to others); surely Allah loves the doers of good. (2:195)

In the Traditions

Imam Jafar said, "When love of Allah takes possession of the innermost being of Allah's bondsman, it empties him of every preoccupation except remembrance of Allah. The lover is the most inwardly sincere of all people for Allah. He is the most truthful in his words, the most faithful in his pledge, the most astute in his actions, the purest in remembrance, and the greatest in devoting his self in worship."

Imam Ali said, "Love of Allah is a fire which does not pass by anything without burning it up; the light of Allah does not come over something without illuminating it."