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wa-ʾidhā ḍarabtum fī l-ʾarḍi fa-laysa ʿalaykum junāḥun ʾan taqṣurū mina ṣ-ṣalāti ʾin khiftum ʾan yaftinakumu lladhīna kafarū ʾinna l-kāfirīna kānū lakum ʿaduwwan mubīnan
When you journey in the land, there is no sin upon you in shortening the prayers, if you fear that the faithless may trouble you; indeed the faithless are your manifest enemies.
— Ali Quli Qarai
Surah An-Nisa', Verse 101
Shortening of the Daily prayers while in travel -Prayer while in the battle
101. "And when you are journeying in the land, it is not sin for you that you shorten the prayer, if you fear that those who disbelieve afflict you. Verily, the infidels are your manifest enemy."
Next to the former discussion upon Holy struggle and Emigration, the holy Qur'an refers to the subject of a Muslim's prayer when the one is in Journey. The Qur'anic phrase / darabtum-fil-'ard / ' you go from one place to another', is an implicit declaration of travelling, because a traveller pounds the land under his feet. (This meaning is narrated from Mufrad'at Raqib, an Arabic dictionary) The Qur'an sometimes applies the sense of 'it is not sin for you' instead of 'obligation '. This verse contains this sense, too.
Curtail worship has not been specified to the aspects of fear alone, but since there is usually fear when a person travels, the phrase 'if you fear' has been mentioned in the verse. Or, since at first the law of curtail worship had been ordained for the circumstances of fear and, afterward, it has been generalized upon every journey, this phrase (if you fear) has been applied here.
Explanations
1. Establishing prayers can never be stopped, but it can have alleviation.
2. Seeing the truth and flexibility is a principle in the Divine law.
3. We should not be inattentive of the enemy even while we are establishing prayers. Policy and religiosity, worship and intelligence are not separate from each other. Our hands should be busy both for prayers and for weapon.
4. Infidelity and faith are in contrast with each other.
5. It seems that all disbelievers are considered as one force in hostility against you. That is why the Arabic word / 'aduww / 'enemy', mentioned in the verse, is used in the singular form, not in the plural form.