We are obligated to mourn for the destruction of the first and second Bet HaMikdash on Tishah B’Av, therefore Hazal established many prohibitions of mourning for this fast day: It is prohibited to eat, drink, wash, anoint oneself, wear shoes, work, sit on a regular chair, learn Torah or cohabit. Engaging in any activity for pleasure (i.e. trip or idle talk) is prohibited. These halachot will now be discussed in detail.