Before this, there was the command to obey Allah and His Messenger. Now, in the present verses, Jihad has been prescribed for the obedient and faithful so that they can vitalize their Faith and raise the word of Allah high and supreme. (Qurtubi)
Commentary
Important Notes
In the first part of the verse: يَا أَيُّهَا الَّذِينَ آمَنُوا خُذُوا حِذْرَكُمْ اَلخ (0 those who believe, take your precautions ...), appears the command to ensure the supply of weapons, while the later part refers to the launching of Jihad action. This tells us two things right away. Firstly, as already clarified at several places, the act of getting together functional means to achieve a good purpose is not contrary to tawakkul or trust in God. Secondly, we see that the text limits. itself to the command to ensure the supply of weapons, but it does not promise that, because of this support, Muslims will have any guaranteed security against their enemies. By doing so, it has been indicated that the choice of using means is for nothing but a certain peace of mind, otherwise, the use of means as such does not carry any operational gain or loss. The Qur'an has said: قُل لَّن يُصِيبَنَا إِلَّا مَا كَتَبَ اللَّـهُ لَنَا (0 Prophet) say: "Nothing will befall us except what Allah has prescribed for us." (9:51)
2. Let us look at the first verse again. It opens up with the command to get ready for Jihad followed by a- description of the marching plan; the later has been expressed in two sentences, that is, فَانفِرُوا ثُبَاتٍ أَوِ انفِرُوا جَمِيعًا (...and march in groups, or march off all together.) Here, the word, 'thubatin' is the plural form of 'thubatun' which means a small group and is used to denote a military company and was called a Sariyyah in the military campaigns of the Holy Prophet ﷺ . In that sense, it is being said here that Muslims, when they go out for Jihad, should not start off all alone. They should, rather, set out in the formation of small groups. The other alternative is to march as a large army: jami’ an' because, in fighting, going 'alone is very likely to hurt --- the enemy is not going to let this opportunity slip out of their hands.
No doubt, this instruction has been given to Muslims for the particular occasion of Jihad, but, even in normal circumstances, this is what the Shari’ ah teaches - do not travel alone. In a hadith, therefore, a lone traveler is called one satan and two of them two satans and three of them become a group or party. Similarly, there is another hadith which says:
خَیر الصحابہ اربعۃ، و خیرالسرایا أبعہ مایٔہ، وخیر اجیوش اربعۃ آلاف .
The best companions are four and the best military company is that of four hundred and the best army is that of four thousand.' (From Mishkat as reported by Al-Tabarani)