فَاسْعَوْا إِلَىٰ ذِكْرِ اللَّهِ وَذَرُوا الْبَيْعَ
Hasten to the remembrance of God and leave trading.
The text expressly directs believers to leave trade at the Friday call and proceed to the remembrance of God. The obstruction of the Friday obligation is also intelligible as the concern behind the prohibition.
The legal discussion consequently examines other activities that produce the same obstruction. It would be inaccurate to say that every contract is named in the wording.
In Hanafi legal analysis, unlawfulness of engaging in a transaction at that moment is distinguished from the separate question of the transaction’s technical formation or validity. The prohibition and the contract’s structure are not identical questions.