The prohibition in the Sunnah against qualifying supplication with the will of Allah: What is the basis for the saying of the Prophet (peace and blessings be upon him) to the sick person: (No harm, it is a purification if Allah wills)?

The questioner : He says: Your Eminence, the Shaykh! I was fifteen years old when I went out hunting with my uncle. We were chasing gazelles, and my uncle was dismounting while I, his younger nephew, was driving the car without knowing how to drive, so I ran over my uncle and killed him. I paid the blood money to my uncle's family. But do I have to perform an expiation by fasting, given that I am able to fast, and when should I start fasting?

The Shaykh : Yes. Every person who kills a protected soul, whether the victim is a Muslim—meaning the one who was killed—or a dhimmi (a non-Muslim under Muslim protection) or a person under a treaty, has an expiation upon him, which is freeing a slave. If he does not find one, then fasting for two consecutive months. If he is unable to do so, then he owes nothing. And this questioner says that he is able to fast the expiation, so let him seek help from Allah after Ramadan and fast the expiation. Yes. But if he wishes to fast the six days after the festival, there is no blame on him. He fasts the six days and then begins the making up of missed fasts. Yes. Buraydah.

The questioner : Peace be upon you and Allah's mercy and blessings. Your Eminence, the Shaykh.

The Shaykh : Peace be upon you, and Allah's mercy and blessings.

The questioner : The prohibition in the Sunnah against qualifying supplication with the will of Allah: What is the basis for his saying (peace and blessings be upon him) to the sick person: ?

The Shaykh : Yes. The prohibition against qualifying supplication with the will of Allah is when a person says: "O Allah, forgive me if You will," and this is uglier than saying: "O Allah, forgive me if Allah wills." This is one point.
Second: The Prophet (peace and blessings be upon him) said: . This is a statement of information. It is a purification for the sick person if he counts on the reward. The sick person may count on the reward, or he may not. If he does not count on the reward, it is not a purification for him. So the saying of the Prophet (peace and blessings be upon him): is like a hope that this sick person is counting on the reward, so his illness becomes a purification for him. And in that case, the qualification does not contradict the prohibition against qualifying supplication with the will of Allah. Also, among the things prohibited is what some people do, saying: "O Allah, I do not ask You to turn back the decree, but I ask You for gentleness in it." This is reprehensible. Rather, ask Allah for well-being. Ask Allah to make you self-sufficient. Ask Allah to teach you. Do not say: "I do not ask You to turn back the decree," because the decree is not turned back except by supplication. How many people have been on the verge of death, and they supplicated or someone supplicated for them, and Allah healed them! The important thing is that this phrase is not permissible to be said: "O Allah, I do not ask You to turn back the decree, but I ask You for gentleness in it".
My brother, ask Allah for well-being; do not ask Allah to test you with gentleness.