Does the first broker deserve a commission, given that the initial attempt to sell the land was unsuccessful, but I continued dealing with the second broker whom he introduced me to, and my efforts were crowned with success in selling the same land to another buyer after a long period, and should he receive an equal share of the commission despite the effort I exerted?

The broker is entitled to the agreed-upon fee if he completes his work. It is not a condition that the work involves effort; rather, mediation and indication, whether verbally, by action, or in writing, are sufficient, provided that the agreed-upon work is completed. Therefore, if the first mediator introduces a third party and the sale of the land is concluded, he is entitled to his fee. As for anything other than that specific land, nothing is owed to the first mediator.