The ruling on one who vows to do something if Allah heals him, and fears he will not be able to fulfill it

Question:
Our sister says: I had made many covenants with Allah, and I swore an oath for every covenant, saying: If such and such happens to me, I will do such and such. I am afflicted with a mental illness, and praise be to Allah, I used to be healed at times, and the illness would return to me at other times. I covenanted with Allah that if He cured me of that illness permanently, I would fulfill those covenants. However, I felt inside that in the future I would not be able to keep them, so I sought forgiveness from Allah and repented to Him. Does that count as breaking the covenant?

Answer:
If a Muslim makes vows that are all acts of obedience, it is obligatory for him to fulfill them according to his ability, whether by fasting, praying, or giving charity, unless what he vowed is disliked, such as fasting for the rest of his life. In that case, the expiation for an oath is sufficient for him if the vow is disliked, or if he prays after the 'Asr prayer, or prays after the Fajr prayer, because those are not times for prayer; the expiation for an oath is sufficient in that case. As for if he vows and makes covenants of obedience, and his condition is met, then he is required to fulfill them, due to the saying of the Prophet (peace and blessings be upon him): and due to His saying, the Exalted: [Al-Insan:7]. And because the hypocrite is the one who does not fulfill his promises. The hypocrite, when he makes a covenant, betrays it; when he vows, he does not fulfill it; when he speaks, he lies; and when he promises, he breaks his promise. Therefore, it is not befitting for a believer to imitate the enemies of Allah, the hypocrites.
So it is obligatory for you to fulfill what you vowed and covenanted, except in the case of inability. If you are unable, then fear Allah as much as you are able. Allah (Exalted and Majestic is He) says: [Al-Baqarah:185], and He says, the Exalted: [Al-Taghabun:16]. So if you vowed, for example, to fast on Mondays and Thursdays, you fast. And if you are afflicted with an illness, you break your fast and make it up.
And likewise, if you vowed charity, if Allah heals you from the illness, and you covenanted with Allah to give one hundred riyals, or one thousand riyals, or more, then do so. If you are unable, it remains a debt in your account [Al-Taghabun:16] until you are able, and then you pay it. As for if the healing has not completed the condition, it has not been completed, I said: If Allah heals me; but the healing has not been completed, then nothing is upon you until the healing is completed. Yes.

The presenter : May Allah reward you with good, and may He do you good.