Hadiths 1.51 to 1.53

1.51:
Narrated `Umar bin Al−Khattab: Allah's Apostle said, "The
reward of deeds depends upon the intention and every person
will get the reward according to what he has intended. So
whoever emigrated for Allah and His Apostle, then his
emigration was for Allah and His Apostle. And whoever
emigrated for worldly benefits or for a woman to marry, his
emigration was for what he emigrated for."

1.52:
Narrated Abu Mas`ud: The Prophet said, "If a man spends on his
family (with the intention of having a reward from Allah)
sincerely for Allah's sake then it is a (kind of) alms−giving
in reward for him.

1.53:
Narrated Sa`d bin Abi Waqqas: Allah's Apostle said, "You will
be rewarded for whatever you spend for Allah's sake even if it
were a morsel which you put in your wife's mouth."