يا أَيُّهَا الَّذينَ آمَنوا إِذا نودِيَ لِلصَّلاةِ مِن يَومِ الجُمُعَةِ فَاسعَوا إِلىٰ ذِكرِ اللَّهِ وَذَرُوا البَيعَ ۚ ذٰلِكُم خَيرٌ لَكُم إِن كُنتُم تَعلَمونَ

O you who have believed, when [the adhan] is called for the prayer on the day of Jumu'ah [Friday], then proceed to the remembrance of Allah and leave trade. That is better for you, if you only knew.