Expiations are obligatory immediately

Your Eminence! Our brother is also asking about the chapter of expiations and says: Is it obligatory for a person to perform the expiation immediately, or is there no harm in the expiation remaining in his liability?
Answer: No, the obligation is immediate. When an expiation becomes obligatory, one must hasten to perform it, whether it is the expiation for zihar, the expiation for intercourse during Ramadan, the expiation for killing, or the expiation for an oath. One must hasten to perform it, because the commands of Allah are immediate, except where evidence indicates that delay is permitted. And Allah, Glorified and Exalted is He, said: [Al-Nur: 31]. So repentance is obligatory from sins, and the expiation is part of the repentance. If the sinner has an expiation for his sin, he combines both matters. For example, the one who commits zihar with his wife must repent and perform the expiation. The one who has intercourse with her during Ramadan must repent and perform the expiation, along with making up the day on which the intercourse occurred. The one who swears and intentionally breaks his oath must repent if the sin is accompanied by an expiation, such as if he says: "By Allah! I will not drink intoxicants," "By Allah! I will not be undutiful to my parents," or "By Allah! I will not backbite anyone," and then he does it. He must repent and perform the expiation together. Just as he must hasten to repent, he must hasten to perform the expiation, because it is part of the completion and perfection of the repentance. Yes.
The presenter: May Allah reward you with good.