Ibn Abi Hatim recorded that Ash-Sha`bi and others stated that the Creator swears by whatever He wills among His creation, but the created only vow by the Creator. Allah said,

﴿وَالنَّجْمِ إِذَا هَوَى ﴾

(By the star when it goes down.) Ibn Abi Najih reported that Mujahid said, "The star refers to Pleiades when it sets at Fajr.'' Ad-Dahhak said "When the Shayatin are shot with it.'' And this Ayah is like Allah's saying;

﴿فَلاَ أُقْسِمُ بِمَوَقِعِ النُّجُومِ - وَإِنَّهُ لَقَسَمٌ لَّوْ تَعْلَمُونَ عَظِيمٌ - إِنَّهُ لَقُرْءَانٌ كَرِيمٌ - فِى كِتَـبٍ مَّكْنُونٍ - لاَّ يَمَسُّهُ إِلاَّ الْمُطَهَّرُونَ - تَنزِيلٌ مِّن رَّبِّ الْعَـلَمِينَ ﴾

(So, I swear by the setting of the stars. And verily, that is indeed a great oath, if you but know. That is indeed an honorable recitation. In a Book well-guarded. Which none can touch but the pure. A revelation from the Lord of all that exists.)(56:75-80) Allah said;

﴿مَا ضَلَّ صَـحِبُكُمْ وَمَا غَوَى ﴾

(Your companion has neither gone astray nor has erred.) This contains the subject of the oath. This part of the Ayah is the witness that the Messenger of Allah is sane and a follower of Truth. He is neither led astray, such as in the case of the ignorant who does not proceed on any path with knowledge, nor is he one who erred, such as in the case of the knowledgeable, who knows the Truth, yet deviates from it intentionally to something else. Therefore, Allah exonerated His Messenger and his Message from being similar to the misguided ways of the Christians and the erroneous paths of the Jews, such as knowing the Truth and hiding it, while abiding by falsehood. Rather, he, may Allah's peace and blessings be on him, and his glorious Message that Allah has sent him with, are on the perfect straight path, following guidance and what is correct.