Does repeated perjury necessitate one expiation or more, and does performing simple tasks during work constitute a violation of an oath, and is it permissible to pay the value of expiation in cash if feeding is not possible?

It is recommended to guard one's oaths and not to hasten into them. If a person swears an oath to abstain from a specific action during work without specifying a time limit, he breaks his oath as soon as he performs that action. He is then obligated to offer a single expiation for the oath, which dissolves it. The expiation for an oath is feeding ten poor persons, clothing them, or emancipating a slave. If one cannot find these, then he must fast for three days, as Allah Almighty says: "So its expiation is the feeding of ten poor persons from the average of that which you feed your [own] families or clothing them or the freeing of a slave. But whoever finds not [the means to do so] - then a fast of three days. That is the expiation for your oaths when you have sworn. And guard your oaths." The feeding is half a Sa' (approximately one and a half kilograms) for each poor person, or a mudd (seven hundred and fifty grams). Charitable organizations can be entrusted to distribute the expiation if no poor persons are found.