بُلُوغُ الْمَرَامِ
Bulugh al-Maram 220
The Book of Prayer
وَعَنْ مُعَاوِيَةَ بْنِ اَلْحَكَمِ - رضى الله عنه - قَالَ : قَالَ رَسُولُ اَللَّهِ - صلى الله عليه وسلم -{ إِنَّ هَذِهِ اَلصَّلَاةَ لَا يَصْلُحُ فِيهَا شَيْءٌ مِنْ كَلَامِ اَلنَّاسِ , إِنَّمَا هُوَ اَلتَّسْبِيحُ , وَالتَّكْبِيرُ , وَقِرَاءَةُ اَلْقُرْآنِ } رَوَاهُ مُسْلِمٌ [1] .
Narrated Mu'awiya bin al-Hakam (RA): Allah's Messenger (ﷺ) said: "Talking is not befitting during the Salat (prayer), for it (prayer) consists only of glorifying Allah, declaring His Greatness and the recitation of the Qur'an." [Reported by Muslim].
Sunnah.com reference: Book 2, Hadith 84