The Great Reward of Doing Good Towards Someone

Imam Hussain (AS) said:

"If a person does good toward his brother for the sake of Allah, to please Allah, Allah will send this goodness to him in his hour of need; moreover, He will keep an even larger store of adversities from him in this life."

[He (AS) also said:] If a person alleviates the sadness and troubles of a believer, Allah will turn away the sadness and troubles of this life and the next from him. Whoever does good, Allah will do good unto him. And surely Allah loves those who do good."

Excerpt from the book 'Radiance of Imam Husayn' by Allama Sayyid Muhammad Husayn Husayni Tihrani (ra)