وَإِذَا قِيلَ لَهُمْ ءَامِنُوا۟ كَمَآ ءَامَنَ ٱلنَّاسُ قَالُوٓا۟ أَنُؤْمِنُ كَمَآ ءَامَنَ ٱلسُّفَهَآءُ ۗ أَلَآ إِنَّهُمْ هُمُ ٱلسُّفَهَآءُ وَلَٰكِن لَّا يَعْلَمُونَ
Important Words:
سفھاء (foolish people) which is the plural of سفیه is derived from سفه i.e. he was or became light-witted or ignorant. The word سفیه means: 1. simple or light-witted or foolish; 2. ignorant; 3. fickle and inconstant; 4. weak in intelligence; 5. one whose opinion is of no consequence; 6. one who squanders away his wealth and property without consideration (Aqrab, Mufradat & Lisan).
یعلمون (they know) is derived from علم i.e. he knew. علمه means: 1. he knew it or became acquainted with it; 2. he knew it thoroughly so as to base his belief on it (Aqrab).
Commentary:
The verse means that when the believers asked the hypocrites to be sincere in their faith, the hypocrites would say that the believers were like fools squandering away their lives and property, a mere handful of men who had taken up the fight against the whole country.
The hypocrites called true Muslims "fools" because they thought they (the hypocrites) could protect their own lives and property by maintaining friendly relations with the disbelievers; while the true Muslims, on account of their complete estrangement from disbelievers, were exposing their lives and possessions to constant danger. Muslims were also given to spending recklessly on religion. Such allegations are contained in 5:59; 8:50; 9:79 & 63:8. God replies to them by saying: Their possessions and their children should not excite thy wonder; Allah only intends to punish them therewith in this world, that their souls may depart while they are disbelievers (9:85). The verse means that soon the hypocrites would witness the ruin of their possessions, while Muslims would prosper. Success and prosperity come, not of cowardice and stinginess, but of courage and sacrifice, and the hypocrites were hopelessly lacking in both these qualities.
In fulfilment of this prophecy ‘Abdullah bin Ubayy, the hypocrite leader, lived to see the frustration of his designs against Islam and his only son became a true and zealous Muslim.
The hypocrites regarded the Muslims as a pack of fools in that they suffered, as the hypocrites thought, useless sacrifice of life and property for a lost cause. They themselves are fools, says the verse, as the cause of Islam is destined to make progress and to prosper.