Allah swears by His creation, in which some of His signs can be seen in His creatures. These also indicate the perfection of His Names and Attributes. He then swears by the hidden things that they cannot see. This is an oath swearing that the Qur'an is His Speech, His inspiration and His revelation to His servant and Messenger, whom He chose to convey His Message, and the Messenger carried out this trust faithfully. So Allah says, (So I swear by whatsoever you see, and by whatsoever you see not, that this is verily the word of an honored Messenger.) meaning, Muhammad. Allah gave this description to him, a description which carries the meaning of conveying, because the duty of a messenger is to convey from the sender. Therefore, Allah gave this description to the angelic Messenger in Surat At-Takwir, where he said, Verily, this is the Word of (this Qur'an brought by) a most honorable messenger. Owner of power (and high rank) with Allah, the Lord of the Throne. Obeyed and trustworthy. (81:19-21) And here, it refers to Jibril. Then Allah says, (and your companion is not a madman. (81:22)) meaning, Muhammad. (And indeed he saw him in the clear horizon. (81:23)) meaning, Muhammad saw Jibril in his true form in which Allah created him.