Al-Jumu'ah - 62:9

يَا أَيُّهَا الَّذِينَ آمَنُوا إِذَا نُودِي لِلصَّلَاةِ مِن يَوْمِ الْجُمُعَةِ فَاسْعَوْا إِلَى ذِكْرِ اللَّهِ وَذَرُوا الْبَيْعَ ذَلِكُمْ خَيْرٌ لَّكُمْ إِن كُنتُمْ تَعْلَمُونَ
[62:9]
O you who believe! when the call is made for prayer on Friday, then hasten to the remembrance of Allah and leave off trading; that is better for you, if you know.
O ye who believe! When the call is proclaimed to prayer on Friday (the Day of Assembly), hasten earnestly to the Remembrance of Allah, and leave off business (and traffic): That is best for you if ye but knew!
O ye who believe! When the call is heard for the prayer of the day of congregation, haste unto remembrance of Allah and leave your trading. That is better for you if ye did but know.