The Hadeeth literature indicates that the Ahlul Bayt (may our salams and Allah peace be unto them all) showed the importance of Nazr by their acts more than once. The following story is recorded in many tafseer books about the revelation of these verses of sura Dahr.
Once the Imam Hasan a.s and Imam Husayn a.s, who were at that time 5 and 4 years old, fell ill. When the Prophet of Islam (s.a.w) , missed them in the mosque, he came to Hazrat Fatima Zahra's (a.s) house to inquire about them. When he was told that they were sick, he suggested that both parents should take a spiritual vow (Nazr) for the children's recovery. So both Imam Ali a.s and Hazrat Fatima Zahra a.s prayed to Allah for the recovery of Imam Hasan and Imam Husayn (peace be unto them all) and took a vow to fast for three consecutive days when the children became well again. The children did recover from the illness soon after. Both parents set about fulfilling their spiritual vow and fasted. When the children saw that, they also decided to fast with their parents and so did the house-maid, Bibi Fiza a.s. But that day there was no food in Hazrat Fatima's (a.s) house even for breaking the fast. So Imam Ali a.s went out looking for work. He could not find any. But he was able to get three kg's of wool to be spun in exchange of three kg's of barley. Hazrat Fatima Zahra a.s spun the wool all day. She a.s was only able to dispense with one kilo of it. So she took only one kilo of barley ground it into flour and prepared five loaves of bread. While they were all ready to break their fast, someone knocked at the door saying: "O people of the house of the Prophet (s.a.w), I am a poor man and I have nothing to eat, is there anything you could do to feed me." At this Imam Ali a.s stood up, went to the door and gave his loaf to the man. Bibi Fatima Zahra a.s did the same. Watching this, both children also gave their loaves and so did the maid. They broke their fast by water and retired. The next day Bibi Fatima Zahra a.s spun another kilo of wool. So she a.s separated one kilo of barley, ground it into flour and prepared five loaves once again. As they were ready to break their fast, once again, a voice called out from the door: "O people of the house of The Prophet (s.a.w), I am an orphan, I am hungry, could you feed me?" Hearing this, Imam Ali a.s stood up and gave his loaf to the man, so did Bibi Fatima Zahra a.s , the children and the maid. They all, once again, broke their fast by water and retired. Came the third day, Bibi Fatima Zahra a.s spun the rest of the wool, took the remaining barley, ground it into flour and prepared five loaves. As they were ready to break the fast, a voice called from the door saying: "O people of the house of the Prophet (s.a.w), I am a prisoner, I am hungry, could you feed me?" Hearing this, once again, Imam Ali a.s stood up and went to the door and gave his loaf away to the prisoner. Hazrat Fatima Zahra a.s , the children and the maid did likewise. Every time the person at the door would want to express his gratitude for the kindness, Imam Ali a.s would say: "No, no, we are not looking for any reward from you for this act, we are doing it out of Allah's love."
Now the children had just been quite ill. And they had not eaten anything in three days. The Prophet of Islam (s.a.w), once again entered the house asking about the children. When he looked at them they were shaking like autumn leaves (those are the exact words in the report). Hazrat Fatima Zahra a.s told him what had been going on in the family. At that time the archangel Gabriel a.s came down with a gift of Allah to the Prophet s.a.w. That gift was the verses of Sura Insan or Dahr (chapter 76), which we quote below.
They fulfill vows and fear a day the evil of which shall be spreading far and wide. And they give food out of love for Him to the poor and the orphan and the captive. We only feed you for Allah's sake; we desire from you neither reward nor thanks: Surely we fear from our Lord a stern, distressful day. Therefore Allah will guard them from the evil of that day and cause them to meet with ease and happiness. And reward them, because they were patient, with garden and silk. (Glorious Qur'an, 76:7-12)
This story tells us that the Prophet of Islam s.a.w, recommended to any family that if and when you are facing a difficult situation or you are distressed, you should do Nazr. In other words, take a spiritual vow that when the problem is over you would offer special prayers or invite friends and relatives for food that has been dedicated to the Ahlul Bayt a.s in Allah's name.
The story is the guiding light for us in our lives. The family of Hazrat Fatima Zahra (peace be unto her) fulfilled their Nazr, but when a more needy person came they gave away their food to him without any regard to their own needs. Glorious Qur'an has made it incumbent upon us to love the Prophet of Islam s.a.w and his holy family and fashion our lives according to how they lived.
Say, (O Prophet), I do not ask you any recompense for this (the mission of Islam), except that you would love my near ones. (Glorious Qur'an, 42:23)