the husband must give honorable and sufficient sustenance to his household according to his status and means. allah, the exalted, says:

(let the rich man spend according to his means, and the man whose resources are restricted, let him spend according to what allah has given him. allah puts no burden on any person beyond what he has given him. allah will grant after hardship ease.)
[65:7]

if a sufficiently rich man refuses to spend on his family in accordance with his level of means, and the wife was able to take a portion of his wealth, she may take that which satisfies her essential needs and that of her children, avoiding wastage and extravagance. hind bint ‘utbah came to the prophet (peace be upon him) complaining about her husband, saying:

“my husband is a miser and does not spend enough on me and his children.”
he replied: “take whatever suffices you and your child within proper bounds.”
[bukhari #5049]

if a husband came under heavy financial strain and was incapable of fulfilling his family’s financial needs, or if he left his wife for an extensive period of time, whereby the wife was harmed due to that absence, the wife is entitled to seek court intervention, if she desires to annul that marriage, as indicated by the verdicts of the jurists in islamic jurisprudence. the prophet of allah (peace be upon him) explained these rights when he said:

“fear allah in (the affairs of) women for you have taken them by the oath of allah, and made their intimate relations legal by the sacred word of allah: your right is that no one you dislike should (be allowed to enter) sit on your bed (or cushions), and if this happens then you may hit them lightly, and their right is that you feed and clothe them within proper bounds.”
[muslim #1218]

the prophet (peace be upon him) said to his companion sa’ad ibn abi waqqas (may allah exalt their mention):

“no amount you spend on your family seeking reward from allah but that he will reward you even if it is a bite of food that you put in your wife’s mouth.
[bukhari #2592 & muslim #1628]