Unlawful oaths/wrong swearing and its compensation

Allâh will not punish you for what is unintentional in your oaths, but He will punish you for your deliberate oaths; for its expiation feed ten Masâkîn (poor persons), on a scale of the average of that with which you feed your own families, or clothe them or manumit a slave. But whosoever cannot afford (that), then he should fast for three days. That is the expiation for the oaths when you have sworn[]. And protect your oaths (i.e. do not swear much)[]. Thus Allâh make clear to you His Ayât (proofs, evidence, verses, lessons, signs, revelations, etc.) that you may be grateful.

Al maeda 89

Comment
I consider this applied to all the matters that Allah will not punish us for our unintentional sins.I expect mercy from Him as He is the Most Merciful and Oft-forgiving

The law of diyyat

It is not for a believer to kill a believer except (that it be) by mistake, and whosoever kills a believer by mistake, (it is ordained that) he must set free a believing slave and a compensation (blood money, i.e Diya) be given to the deceased's family, unless they remit it. If the deceased belonged to a people at war with you and he was a believer; the freeing of a believing slave (is prescribed), and if he belonged to a people with whom you have a treaty of mutual alliance, compensation (blood money - Diya) must be paid to his family, and a believing slave must be freed. And whoso finds this (the penance of freeing a slave) beyond his means, he must fast for two consecutive months in order to seek repentance from Allâh. And Allâh is Ever All¬Knowing, All¬Wise.

And whoever kills a believer intentionally, his recompense is Hell to abide therein, and the Wrath and the Curse of Allâh are upon him, and a great punishment is prepared for him.

An-Nisa 92