Hadith 7.81 to 7.83

7.81:
Narrated `Uqba:
The Prophet said: "The stipulations most entitled to be abided
by are those with which you are given the right to enjoy the
(women's) private parts (i.e. the stipulations of the marriage
contract).

7.82:
Narrated Abu Huraira: The Prophet said, "It is not lawful for
a woman (at the time of wedding) to ask for the divorce of her
sister (i.e. the other wife of her would−be husband) in order
to have everything for herself, for she will take only what
has been written for her."

7.83:
Narrated Anas bin Malik: `Abdur−Rahman bin `Auf came to
Allah's Apostle and he had marks of Sufra (yellow perfume).
Allah's Apostle asked him (about those marks). `AbdurRahman
bin `Auf told him that he had married a woman from the Ansar.
The Prophet asked, "How much Mahr did you pay her?" He said,
"I paid gold equal to the weight of a date stone." Allah's
Apostle said to him, "Give a wedding banquet, even if with one
sheep."