بِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيمِ

إِنَّا أَعْطَيْنَاكَ الْكَوْثَرَ ﴿۱﴾ فَصَلِّ لِرَبِّكَ وَانْحَرْ ﴿۲﴾ إِنَّ شَانِئَكَ هُوَ الْأَبْتَرُ ﴿۳﴾

﴾1﴿ Innaaa a'tainaa kal kauthar
﴾2﴿ Fasalli li rabbika wanhar
﴾3﴿ Inna shaani'aka huwal abtar

﴾1﴿ Indeed, We have given you abundant goodness
﴾2﴿ So pray exclusively to your Lord and offer sacrifice
﴾3﴿ Indeed, your enemy alone is the one who is without goodness (cut off)

Surah Al-Kauthar

The Abundance

And another name for this surah is Surah Al-Nahr.
Relevancy: This surah corresponds to the previous one in several ways: The first aspect is that in the previous surah, there was a rebuke for certain traits, whereas in this surah, there is a command to adopt their opposite qualities. The second aspect is that in the previous surah, the denier of the religion was mentioned, who is an enemy of the Prophet (May Allah bless him and give him peace). In this surah, those matters are mentioned that lead to his being cut off (abtar).
Claim of this surah: Three matters are mentioned for the defeat of the enemy. Additionally, one name of Allah the Exalted (Rab) and one of His active attributes are mentioned.
Summary of the surah: Firstly, the blessing of Kawthar is mentioned, which refers to the Qur'an in this world, and through it, drinking from Kawthar in the Hereafter is attained. (In this, there is also an implicit command to proclaim the Qur'an.) Then, two etiquettes for the caller (da'i) are mentioned, and within this, the rejection of polytheism in both physical and financial worship is emphasized. After that, the outcome is stated: the defeat of the enemy, which itself is another blessing.
Note: From this surah until Surah An-Nas, the addresses are directed towards the people of the Qur'an, mentioning the etiquettes for them.

interpretation

[1] In this verse, the apparent blessing is granted to the Prophet (May Allah bless him and give him peace), but implicitly, it includes the command to invite people to the Qur'an—meaning: "Indeed, We have given you Al-Kawthar, so proclaim it to the people." The essence of this is that Al-Kawthar in this world refers to the Qur'an and prophethood, while in the Hereafter, Al-Kawthar refers to the Hawd (the Prophet’s basin) or a river. Whoever attains goodness and guidance from the Qur'an in this world will attain satiation from Al-Kawthar in the Hereafter. Qadi ‘Iyad (may Allah have mercy on him) has stated that the ahadith of the Hawd are authentic, and faith in it is obligatory. Among Ahl as-Sunnah wa’l-Jama’ah, it is taken in its apparent meaning and cannot be subjected to interpretation.
[2] These etiquettes are for the people of the Qur’an: (فَصَلِّ) – This includes the five daily prayers, the Eid prayer, the Muzdalifah prayer, and all voluntary prayers. (لِرَبِّكَ) – This is an implicit rebuke against the polytheists, as they perform prayers or parts of prayers (such as standing, bowing, and prostrating) for their false deities, including idols, graves, the sun, the moon, and others. Thus, you should do the opposite—pray solely for your Lord. (وَانْحَرْ) – Nahr refers to the slaughtering of camels, whether at Mina or at other times and places. Due to its conjunction with (لِرَبِّكَ), it is meant to refute the polytheists, who also perform nahr (slaughter), sacrifices, and vows for other than Allah. The mention of camel slaughter specifically signifies all forms of financial worship.
[3] This is the outcome of what was mentioned before: Due to Al-Kawthar (through actions and calling others) and through sincere bodily and financial worship, your enemy becomes abtar (cut off). (شَانِئَكَ) – Shan’an means hatred and enmity. The enemy’s name is not mentioned so that this ruling applies to anyone who possesses these traits. The intended meaning refers to those who harbor hatred either towards the person of the Prophet (May Allah bless him and give him peace) or towards his guidance, which is the Qur'an and Sunnah. In reality, no one has ever truly hated his blessed person, but rather, they have hated his religion. (هُوَ الْأَبْتَرُ) – This indicates that abtar-ness (being cut off) is specific to those who hate the truth. The Qur'an and the Prophet (May Allah bless him and give him peace) are not abtar, because their followers and students will continue until the near arrival of the Day of Judgment, constantly remembering them with honor. (الْأَبْتَرُ) – Batr in language means to cut off. In the case of humans, abtar refers to someone without offspring. In animals, it describes one without a tail. In other matters, it refers to something devoid of goodness. The definite article (ال) in al-abtar signifies the ultimate form of being cut off. This is the deserved fate of anyone who harbors hatred towards what the Messenger of Allah (May Allah bless him and give him peace) has brought. Examples include: Those who distort the meanings of the Qur'anic verses related to Allah's attributes (Ayat As-Sifat). Some individuals claiming to follow the Salaf who, when Qur'anic verses and hadith are used as evidence, reject or despise them. Certain Sufis who listen to music and dance, but do not show reverence when listening to the firm and noble words of the Qur’an. Those who elevate the statements of other people and worldly knowledge above the Qur'an and Hadith. All of these fall under the category of abtar.