As Salamu Alaikum wa Rahmatullahi wa Barakatuhu
Surah An-Nas 
In the Name of Alldh, the Most Beneficent, the Most Merciful
1. Say: "I seek refuge with (Allah) the Lord of mankind,
2. The King of mankind,
3. The Illah (God) of mankind,
4. From the evil of the whisperer (devil who whispers in the hearts of men) who withdraws (from his whispering in one's heart after one remembers Allah),
5. Who whispers in the breasts of mankind,
6. Of jinn and mankind.
Its Name
It is called Surah An-Nas not only because it is a word that appears in its first verse, but also because it is a word that appears five times in this short Surah.
The Subject Matter Of This Surah
In it, we seek protection with Allah Almighty from the most evil and wicked of our enemies, Iblis (Satan, Le., the Devil), and from his helpers, some of whom are from the jinn and some of whom are from mankind. The Devil and his helpers strive to lead man astray by whispering evil ideas into his heart and by any other means available.
The Meanings Of Its Words
A'oothu: I seek refuge, protection, and aid in ...
Bi-Rabbin-Naas The Creator, Owner and Lord of Mankind.
Malikin-Naas: The Master, King and Ruler of mankind.
Ilahin-Naas: The God of mankind, because no one deserves to be worshipped save Him.
Min Sharril-Waswaas: From the evil of the whisperer (Shaitaan), the noun is used because he whispers much evil into the hearts of men.
Al-Khannaas:The one who recoils and draws back from the heart when Allah Almighty is remembered.
Fee Sudoorin-Naas: (The Shaitan whispers) in their hearts when they are neglectful in remembering Allah Almighty.
Minal-jinnati wan-Naas: From the devils of the jinn and from the devils of mankind.
The Meaning in Summary
In this Surah we seek refuge in the Lord, King and God of mankind from the Shaitan (Satan), who is the source and material of all evil. He whispers in the hearts of men, beautifying evil deeds to them, making those deeds take on a good form. He invigorates them to do evil and enervates them from doing good, always twisting and distorting reality. But when one remembers His Lord and seeks His aid, the Shaitan recoils and draws back. Therefore, man should always seek refuge and protection in Allah Almighty, the Lord of all that exists. The Shaitan strives to take man away from his main purpose, the worship of Allah Almighty alone, which is why we must repel his evil by remembering Allah Almighty; indeed, the Shaitan desires to make men join him and desires to make them become some of the inhabitants of the Hellfire. Whisperings and enticements to doing evil can issue from both jinn and men, which is why Allah Almighty says, "Of jinn and mankind."
Explaining this chapter, fun Kathir said that three of Allah's Attributes are mentioned: Lordship (Rububiyyah), Kingship (Mulk), and Godhood (Uluhiyyah).
He Almighty is the Lord, King, and God of all things. Because Allah Almighty has those perfect qualities, we seek refuge and protection in Him from the evil whisperings of the Khannas (i.e., the Shaitan, who recoils when Allah Almighty is remembered). To every man is appointed a devil companion, who beautifies evil deeds in his eyes.
In his Sahih, Muslim recorded that 'Abdullah bin Mas'ud (Radhi Allahu Anhu), said Allah's Messenger (Sallallahu Alayhi wa Sallam) said:
“There is none from you except that he is entrusted with a companion from the jinn."
The Companions asked, "And you as well, 0 Messenger of Allah." He (Sallallahu Alayhi wa Sallam) said:
"And me as well, except that Allah has helped me overcome him, and he has become a Muslim. He doesn't order me except to do good."
There are two narrations: the fIrst one, as mentioned above, indicates that the jinn companion of the Prophet (Sallallahu Alayhi wa Sallam) accepted Islam and became a believer; the second narration indicates that no, his (Sallallahu Alayhi wa Sallam) jinn companion didn't accept Islam, but that Allah Almighty kept the Prophet safe from his evil and temptation.
What Can Be Derived From These Verses
1. We must seek refuge and protection in Allah Almighty from the Shaitan (the Devil).
2. We seek refuge in Allah Almighty, with His Lordship, with His being the Possessor and Owner of all things, with His being the One true God Who is worshipped alone, with His Beautiful Names and Exalted Attributes.
3. Mankind is honored here as Allah Almighty specifically mentions that He Almighty is their Lord, even though He Almighty is the Lord of all that exists.
4. The Shaitan is man's most bitter foe; he tries to lead man astray by whispering evil thoughts to him.
5. We must be wary of the Shaitan, his whispers, and we should never be neglectful in remembering Allah Almighty.
6. When we mention Allah Almighty, the Shaitan is repelled, and he withdraws in a state of grief.
7. When we seek refuge and protection in Allah Almighty, we are worshipping Him; so to dedicate this kind of worship to anyone else is Shirk.
8. We must seek refuge and protection in Allah from both the devils from among the jinn and from the devils among man.
9. Allah Almighty alone deserves to be worshipped. He is the Owner and Possessor and King of all that exists, and He Almighty alone deserves to be worshipped by creation.
l0. Just as the Shaitan whispers in the hearts of man, he also whispers in the hearts of jinn.
Important Benefit
The Qur'an ends on the Mu'awwithatain and begins with AI¬Fatihah, so it has both a good beginning and end. That is the epitome and pinnacle of beauty because the worshipper seeks protection with his Lord at the beginning of his affairs and at the end of them.
Important Note
Ibn 'Abbas (Radhi Allahu Anhu), said, "The Shaitan crouches on the heart of the son of Adam; when he (i.e. the son of Adam) forgets and is heedless (of the remembrance of Allah), he whispers. But when the son of Adam remembers Allah, he recoils and draws back." The Prophet (Sallallahu Alayhi wa Sallam) said:
Indeed, Shaitan puts his snout on the heart of the son of Adam. If he (the son of Adam) remembers Allah, he recoils, and if he forgets, he devours his heart: and that is the whispering one who recoils and draws back. 
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