Allah's Messenger (ﷺ) (p.b.u.h) talked about Friday and said, "There is an hour (opportune time) on Friday and if a Muslim gets it while praying and asks something from Allah, then Allah will definitely meet his demand." And he (the Prophet) pointed out the shortness of that time with his hands.
Sahih al-Bukhari Book 11, Hadith 59
← Previous Hadith Allah's Messenger (ﷺ) (p.b.u.h) said, "When the Imam is delivering the Khutba, and you ask your companion to keep quiet and listen, then no doubt you have done an evil act."

Sahih al-Bukhari Book 11, Hadith 58 Next Hadith → While we were praying (Jumua Khutba & prayer) with the Prophet (p.b.u.h), some camels loaded with food, arrived (from Sham). The people diverted their attention towards the camels (and left the mosque), and only twelve persons remained with the Prophet. So this verse was revealed: "But when they see Some bargain or some amusement, They disperse headlong to it, And leave you standing." (62.11)

Sahih al-Bukhari Book 11, Hadith 60