‏الصلاة : Hadeeth No:1846 Abu Huraira reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: If you (even) ask your companion to be quiet on Friday while the Imam is delivering the sermon, you have in fact talked irrelevance....

‏الصلاة : Hadeeth No:1445 Khufaf b. Ima' al-Ghifari reported that the Messenger of Allaah (sallAllaahu alayhi wa sallam) aid in prayer: 0 Allaah I curse the tribes of Lihyan, Ri'l, Dhakwan, and 'Usayya for they disobeyed Allaah and His Messenger (sallAllaahu alayhi wa sallam). Allaah pardoned (the tribe of) Ghifar and Allaah...