Al-Fajr 89:5

<h2>Which was revealed in Makkah</h2><h2>Recitation of Surat Al-Fajr in the Prayer</h2><p>An-Nasa'i recorded a narration from Jabir that Mu`adh prayed a prayer and a man came and joined him in the prayer. Mu`adh made the prayer long, so the man went and prayed (alone) at the side of the Masjid, and then left. When Mu`adh was informed of this he said, "(He is) a hypocrite." He (Mu`adh) then informed the Messenger of Allah ﷺ of what happened. The Prophet then asked the young man (about it) and he replied, "O Messenger of Allah! I came to pray with him, but he made the prayer too long for me. So I left him and prayed at the side of the Masjid. Then I went to feed my she-camel." The Messenger of Allah ﷺ then said,</p><p>«أَفَتَّانٌ يَا مُعَاذُ؟ أَيْنَ أَنْتَ مِنْ</p><p>سَبِّحِ اسْمَ رَبِّكَ الاّعْلَى</p><p>وَالشَّمْسِ وَضُحَـهَا</p><p>وَالْفَجْرِ</p><p>وَالَّيْلِ إِذَا يَغْشَى »</p><p>(Are you causing trouble Mu`adh Why don't you recite (`Glorify the Name of your Lord the Most High'), (`By the sun and its brightness'), (`By the dawn'), (and (`By the night as it envelops'))</p><p>بِسْمِ اللَّهِ الرَّحْمَـنِ الرَّحِيمِ</p><p>In the Name of Allah, the Most Gracious, the Most Merciful</p><h2>The Explanation of Al-Fajr and what comes after it</h2><p>Concerning Al-Fajr, …

There surely is an oath for thinking man.

Is there (not) in these an adjuration (or evidence) for those who understand?

There is indeed in them (the above oaths) sufficient proofs for men of understanding (and that, they should avoid all kinds of sins and disbeliefs, etc.)!

Is there in this an oath for a rational person?