Mukhtasar Bukhari (Abridged) 625 — Speaking is prohibited in prayer

Narrated Sayyiduna Zaid bin Arqam (may Allah be pleased with him): We used to talk during the prayer in the time of the Messenger of Allah (peace and blessings of Allah be upon him). Any one of us would say his need to the one next to him, until this verse was revealed: "Guard strictly your prayers, especially the middle prayer, and stand before Allah with devotion." (Surah Al-Baqarah: 238). So we were commanded to observe silence in prayer.