From Sahih Bukhari (Hadith 1200):
Narrated Zaid bin Arqam:In the lifetime of the Prophet (ﷺ) we used to speak while praying, and one of us would tell his needs to his companions, till the verse, 'Guard strictly your prayers (2.238) was revealed. After that we were ordered to remain silent while praying
Reference: Bukhari 1200