Sayyiduna Zayd bin Arqam (may Allah be pleased with him) narrated that previously, while performing prayer, we used to talk as well; anyone would speak to his brother regarding any need of his, until this verse was revealed: "Guard strictly the prayers, especially the middle prayer, and stand before Allah with devotion." (Al-Baqarah 2:238) Through this verse, we were commanded to remain silent during prayer.