What mitzvot are violated by ignoring a lost object belonging to a fellow Jew?
Halacha 1: Ignoring a lost object negates a positive commandment and transgresses two negative commandments (Deuteronomy 22:1-3).
Question 2
A lost object is found in a city where the majority are gentiles. Must it be announced?
Halacha 6: If the majority of inhabitants are gentiles, a finder in a place where most people pass may keep the lost object.
Question 3
A man puts his cow in a cowshed with a broken fence without repairing it. If the cow escapes, must a finder return it?
Halacha 10: When a person intentionally abandons property (placing a cow in a broken enclosure), there is no obligation to return it.
Question 4
A father tells his son, 'Do not return that lost object.' What should the son do?
Halacha 18: The son must return it — by obeying his father he would cause his father to transgress a Torah commandment.
Question 5
Is a Torah scholar who would not normally carry heavy objects obligated to return a lost sack or basket?
Halacha 12: A sage or respected elder who would not usually carry such articles is not obligated — dignity is considered in applying the return obligation.