Praise be to Allah, and peace and blessings be upon the Messenger of Allah. To proceed:
It is not correct to say that the presence of spider webs in the house is a cause of poverty. There is no authentic evidence supporting this belief, and the reports that have been narrated regarding this matter are not established. Therefore, this is one of the superstitions that people pass around among themselves.
As for poverty, it has various causes, including sins and abandoning the fear and consciousness of Allah. Allah Almighty says:
“And whoever is mindful of Allah, He will make a way out for him, and provide for him from where he does not expect.”
[At-Talaq: 2–3]
Among the causes of reduced provision is also weak reliance upon Allah and abandoning the taking of proper means. Reliance upon Allah does not mean abandoning work and striving. Rather, a Muslim relies upon Allah while taking the lawful means that Allah has made a path toward obtaining provision.
Among the lawful means through which one may hope for an increase in provision and blessing in it are:
Seeking forgiveness from Allah.
Maintaining ties of kinship.
Giving charity and spending in the cause of Allah.
Having mindfulness and fear of Allah Almighty.
Performing Hajj and Umrah and performing them repeatedly.
Supplicating to Allah and asking Him for good and lawful provision.
Nevertheless, the abundance or restriction of provision ultimately occurs according to Allah’s will, decree, and wisdom. He may grant abundance to some of His servants and restrict it for others for reasons that He, Glorified be He, knows. Allah Almighty says:
“Say: Indeed, my Lord extends provision for whom He wills and restricts it.”
[Saba: 36]
Therefore, a Muslim should not regard spider webs as an evil omen or believe that they bring poverty. Rather, he should rely upon Allah, be mindful of Him, take the proper means, and ask Him from His bounty.
And Allah knows best.