Al Kafi Vol 2 Page 634 -

Al-Kafi , Volume 2, Page 634 – The chapter on the believer’s duty to another believer.

“The believer’s affair is all good: if Allah grants him ease, he is grateful – and that is good for him. And if He afflicts him with hardship, he is patient – and that is good for him.” al kafi vol 2 page 634

Page 634 of Al-Kafi , Vol. 2.