What Effect does Marriage have on the Sustenance of a Woman?

This accepted principle among Muslims, that marriage leads to an increase in sustenance, is taken from the verses of the Qur'an and hadiths. The Holy Quran says this:

Marry off those who are single among you, and the upright among your male and female slaves. If they are poor, Allah will enrich them out of His grace, and Allah is all-bounteous, all-knowing. Marry off those who are single among you, and the upright among your male and female slaves. If they are poor, Allah will enrich them out of His grace, and Allah is all-bounteous, all-knowing.[1] 

The Prophet of Islam (PBUH) said in this connection: get a living by marrying;[2]

His Holiness (PBUH) says in another place:

marry your unmarried handmaids; Because God Almighty makes their morals good, It creates breadth and blessing in their sustenance and increases their virtue and courage.[3]

The narrator says I said to Imam Sadiq (A.S): Can a person take a loan and go to Hajj? He said: Yes. I said: Can he borrow and get married? said: Yes, because he is waiting every day and every night for his day to come from God.[4]

Can a person borrow money and go on Hajj? He said: Yes, I said: Can he borrow and get married? He said: Yes because he waits every day and every night for his day to come from God.

According to the Qur'anic verse and the narrations that have been included in this matter, it seems that the abundance of daily life can be obtained through marriage at least in these ways.

Considering that God is the absolute and immediate agent and everything is done with His permission, Sustenance is also in the hands of God and Allah provides whomever He wishes without any reckoning..[5] Sometimes the servants notice it.[6] May God's sustenance reach some of his servants without an account, But I did not realize it normally.

More sustenance can be a natural result of marriage and family formation. Those who are not yet married and do not have a wife or children usually live in their father's house and eat their meals there and sometimes with their friends outside the house. Therefore, there is little incentive to work and collect wealth to provide housing, they don't have a car, etc, But as soon as the same person starts a family, the motivation is found inside him to have a child.

References:

[1] Noor, 32, Noor, 32, 
وَأَنْكِحُوا الْأَيَامَىٰ مِنْكُمْ وَالصَّالِحِينَ مِنْ عِبَادِكُمْ وَإِمَائِكُمْ ۚ إِنْ يَكُونُوا فُقَرَاءَ يُغْنِهِمُ اللَّهُ مِنْ فَضْلِهِ ۗ وَاللَّهُ وَاسِعٌ عَلِ

[2] . Tabarsi, Hassan bin Fazl, Makarem al-Akhlaq, p. 196, Sharif Razi, Qom, 4th edition, 1412 AH, 1370 SH.

[3]   Undi, Seyyed Fazlullah, Al-Nawader, p. 36, Dar Al-Kitab, Qom. First edition, beta.   «قَالَ رَسُولُ اللَّهِ (ص‏) زَوِّجُوا أَیَامَاکُمْ فَإِنَّ اللَّهَ یُحْسِنُ لَهُمْ فِی أَخْلَاقِهِمْ وَ یُوَسِّعُ لَهُمْ فِی أَرْزَاقِهِمْ وَ یَزِیدُهُمْ فِی مُرُوَّاتِهِ»،

[4] Sheikh Sadouq, Man La Yahdrah al-Faqih, vol. 3, pp. 182 and 183, Islamic Publication Office, Qom, second edition, 1413 AH,  «رَوَى الْمِیثَمِیُّ عَنْ أَبِی مُوسَى قَالَ قُلْتُ لِأَبِی عَبْدِ اللَّهِ (ع) جُعِلْتُ فِدَاکَ یَسْتَقْرِضُ الرَّجُلُ وَ یَحُجُّ قَالَ نَعَمْ قُلْتُ یَسْتَقْرِضُ وَ یَتَزَوَّجُ قَالَ نَعَمْ إِنَّهُ یَنْتَظِرُ رِزْقَ اللَّهِ غُدْوَةً وَ عَشِیَّةً»

[5] Al Imran, 37, «إِنَّ اللَّهَ یَرْزُقُ مَنْ یَشاءُ بِغَیْرِ حِسابٍ»، 

[6]  Whenever Zechariah visited her in the sanctuary, he would find provisions with her. He said, ‘O Mary, from where does this come for you?’ She said, ‘It comes from Allah. Allah provides whomever He wishes without any reckoning.’