情けは人の為ならず

なさけはひとのためならず

expression

the good you do for others is good you do yourself, those who are kind benefit themselves, compassion is not for other people's benefit(proverb)

you can't save others (from themselves)(proverb)(incorrect usage)

情	feelings, emotion, passion, sympathy, circumstances, facts
人	person
為	do, change, make, benefit, welfare, be of use, reach to, try, practice, cost, serve as, good, advantage, as a result of

ぜったい

、

なさひとため

！

ほうび

This is definitely, 'The good you do for others is good you do yourself'! It's a reward because I was helpful