"La primera piedra" refers to the famous Biblical passage from the Gospel of John (8:1-11). The phrase comes from the saying: ("He that is without sin among you, let him first cast a stone at her").
The song explores themes of judgment and human fallibility, drawing on the biblical motif of "casting the first stone." la primera piedra ok.ru
It seems you're looking for a long paper, article, or video titled on the website ok.ru (a social network and video hosting platform, popular in Russian-speaking regions and for hosting full-length films/documentaries). "La primera piedra" refers to the famous Biblical
Independent Spanish-language short films with the same title are sometimes hosted by film enthusiast groups. la primera piedra ok.ru