Yamin (an oath or sworn affirmation) is a legally and spiritually binding commitment made by swearing by Allah or His attributes. In Islamic law, oaths are taken seriously as they invoke the name of Allah as a witness to one's statement or promise. The Quran instructs: "And do not make your oaths a means of deception among you" (16:94). Oaths may be taken regarding past events (affirming something true), future actions (promising to do or refrain from something), or in judicial proceedings to establish claims. Islam distinguishes between casual oaths (yamin al-laghw) uttered without serious intent, for which expiation is not required; deliberate oaths about future actions (yamin mun'aqidah), which must be fulfilled or expiated if broken; and false oaths (yamin ghamus) deliberately swearing falsely, which is a major sin requiring sincere repentance. The expiation (kaffarah) for breaking a deliberate oath involves feeding or clothing ten poor people, freeing a slave, or fasting three days (5:89). The Prophet (peace be upon him) warned: "Whoever swears an oath falsely to usurp the property of a Muslim will meet Allah while He is angry with him" (Bukhari and Muslim). Yamin reminds believers of their accountability before Allah, encouraging truthfulness, commitment, and careful speech. Taking oaths is permitted but discouraged if they become habitual. The Quran advises: "Do not make Allah, by your oaths, a hindrance to being righteous" (2:224). This means that one should not use oaths to avoid doing good or fulfilling obligations. Oaths should not be taken lightly, and breaking them requires expiation. The expiation for a broken oath is to feed ten poor people (the average daily food), or to clothe them, or to free a slave. If one cannot afford any of these, they must fast for three days. This expiation restores the spiritual balance and fulfills the obligation. For believers, taking an oath is a serious matter. It invokes Allah's name as witness, and breaking it requires both expiation and repentance. The believer is truthful, keeps their promises, and avoids unnecessary oaths. When an oath is broken, they fulfill the expiation with sincerity, seeking Allah's forgiveness. The ultimate oath is the one taken on the Day of Judgment, when every soul will swear by Allah, but only the truthful will be saved. The believer lives with integrity, mindful of their words and commitments, and trusting in Allah's mercy for any shortcomings.