It is commonly accepted that any Islamic marriage (Nikha) must include a mahr, a gift to the bride from the husband in order for the marriage to be valid.
The following verses are sited as evidence:
(4:4) : وَآتُوا النِّسَاءَ صَدُقَاتِهِنَّ نِحْلَةً فَإِنْ طِبْنَ لَكُمْ عَنْ شَيْءٍ مِنْهُ نَفْسًا فَكُلُوهُ هَنِيئًا مَرِيئًا
(4:4) : And give the women [upon marriage] their [bridal] gifts graciously. But if they give up willingly to you anything of it, then take it in satisfaction and ease. By : Saheeh International
(4:25) : وَمَنْ لَمْ يَسْتَطِعْ مِنْكُمْ طَوْلًا أَنْ يَنْكِحَ الْمُحْصَنَاتِ الْمُؤْمِنَاتِ فَمِنْ مَا مَلَكَتْ أَيْمَانُكُمْ مِنْ فَتَيَاتِكُمُ الْمُؤْمِنَاتِ وَاللَّهُ أَعْلَمُ بِإِيمَانِكُمْ بَعْضُكُمْ مِنْ بَعْضٍ فَانْكِحُوهُنَّ بِإِذْنِ أَهْلِهِنَّ
وَآتُوهُنَّ أُجُورَهُنَّ بِالْمَعْرُوفِ مُحْصَنَاتٍ غَيْرَ مُسَافِحَاتٍ وَلَا مُتَّخِذَاتِ أَخْدَانٍ فَإِذَا أُحْصِنَّ فَإِنْ أَتَيْنَ بِفَاحِشَةٍ فَعَلَيْهِنَّ نِصْفُ مَا عَلَى الْمُحْصَنَاتِ مِنَ الْعَذَابِ ذَلِكَ لِمَنْ خَشِيَ الْعَنَتَ مِنْكُمْ
وَأَنْ تَصْبِرُوا خَيْرٌ لَكُمْ وَاللَّهُ غَفُورٌ رَحِيمٌ
(4:25) : And whoever among you cannot [find] the means to marry free, believing women, then [he may marry] from those whom your right hands possess of believing slave girls. And Allah is most knowing about your faith. You [believers] are of one another. So marry them with the permission of their people and give them their due compensation according to what is acceptable. [They should be] chaste, neither [of] those who commit unlawful intercourse randomly nor those who take [secret] lovers. But once they are sheltered in marriage, if they should commit adultery, then for them is half the punishment for free [unmarried] women. This [allowance] is for him among you who fears sin, but to be patient is better for you. And Allah is Forgiving and Merciful. By : Saheeh International
The interesting thing about these two verses is that neither contain the word Mahr.
Among the pagan
as an essential condition
a legal marriage, and only when a
mahr had been given did a proper legal relationship a
rise. A marriage
mahr was regarded as shameful.
mohar , Syriac mahrā ,
"bridal gift", originally "purchase-money", synonymous with
ṣadāḳ which properly means "friendship", then "present", a gift given voluntarily and not as a result of a contract, is in Muslim
law the gift which the bridegroom has to give the bride when the contract of marriage is made and which becomes the property of the wife.
In fact, the word featured in the verse is sadaquthinna.
So the verse actually says:
4:4 give the weaker segments (ANNISA) contributions to them , but if they give up willingly anything of it, then you can take it.
In other words
Give the weaker segment's financial contributions to them as they probaly need it But if they still want you to keep it then there is no blame on you for keeping it.