Ayah

Word by Word
رَّبُّكُمۡ
Your Lord
أَعۡلَمُ
(is) most knowing
بِكُمۡۖ
of you
إِن
If
يَشَأۡ
He wills
يَرۡحَمۡكُمۡ
He will have mercy on you
أَوۡ
or
إِن
if
يَشَأۡ
He wills
يُعَذِّبۡكُمۡۚ
He will punish you
وَمَآ
And not
أَرۡسَلۡنَٰكَ
We have sent you
عَلَيۡهِمۡ
over them
وَكِيلٗا
(as) a guardian
رَّبُّكُمۡ
Your Lord
أَعۡلَمُ
(is) most knowing
بِكُمۡۖ
of you
إِن
If
يَشَأۡ
He wills
يَرۡحَمۡكُمۡ
He will have mercy on you
أَوۡ
or
إِن
if
يَشَأۡ
He wills
يُعَذِّبۡكُمۡۚ
He will punish you
وَمَآ
And not
أَرۡسَلۡنَٰكَ
We have sent you
عَلَيۡهِمۡ
over them
وَكِيلٗا
(as) a guardian
Translation

It is your Lord that knoweth you best: If He please, He granteth you mercy, or if He please, punishment: We have not sent thee to be a disposer of their affairs for them.
Tafsir

Your Lord knows you best. If He will, He will have mercy on you, by way of [granting you] repentance and faith, or, if He will, for you to be chastised, He will chastise you, by having you die in disbelief. And We did not send you to be a guardian over them, and so compel them to [embrace] faith - this was [revealed] before the command to fight [them].
"People should speak Good Words with Politeness
Allah commands:
وَقُل لِّعِبَادِي يَقُولُواۡ الَّتِي هِيَ أَحۡسَنُ إِنَّ الشَّيۡطَانَ يَنزَغُ بَيۡنَهُمۡ إِنَّ الشَّيۡطَانَ كَانَ لِلِنۡسَانِ عَدُوًّا مُّبِينًا
And say to My servants that they should say those words that are best. (Because) Shaytan verily, sows a state of conflict and disagreement among them. Surely, Shaytan is to man a plain enemy.
Allah commands His servant Muhammad to tell the believing servants of Allah that they should address one another in their conversations and discussions with the best and politest of words, for if they do not do that, Shaytan will sow discord among them, and words will lead to actions, so that evil and conflicts and fights will arise among them. For Shaytan is the enemy of Adam and his descendants, and has been since he refused to prostrate to Adam. His enmity is obvious and manifest. For this reason it is forbidden for a man to point at his Muslim brother with an iron instrument, for Shaytan may cause him to strike him with it.
Imam Ahmad recorded that Abu Hurayrah said:
""The Messenger of Allah said:
لَاا يُشِيرَنَّ أَحَدُكُمۡ إِلَى أَخِيهِ بِالسِّلَاحِ فَإِنَّهُ لَاا يَدۡرِي أَحَدُكُمۡ لَعَلَّ الشَّيۡطَانَ أَنۡ يَنۡزِعَ فِي يَدِهِ فَيَقَعَ فِي حُفۡرَةٍ مِنَ النَّار
No one of you should point at his brother with a weapon, for he does not know whether Shaytan will cause him to strike him with it and thus be thrown into a pit of Fire.
Al-Bukhari and Muslim recorded this Hadith with the chain of narration from Abdur-Razzaq
People should speak Good Words with Politeness
Allah commands:
وَقُل لِّعِبَادِي يَقُولُواۡ الَّتِي هِيَ أَحۡسَنُ إِنَّ الشَّيۡطَانَ يَنزَغُ بَيۡنَهُمۡ إِنَّ الشَّيۡطَانَ كَانَ لِلِنۡسَانِ عَدُوًّا مُّبِينًا
And say to My servants that they should say those words that are best. (Because) Shaytan verily, sows a state of conflict and disagreement among them. Surely, Shaytan is to man a plain enemy.
Allah commands His servant Muhammad to tell the believing servants of Allah that they should address one another in their conversations and discussions with the best and politest of words, for if they do not do that, Shaytan will sow discord among them, and words will lead to actions, so that evil and conflicts and fights will arise among them. For Shaytan is the enemy of Adam and his descendants, and has been since he refused to prostrate to Adam. His enmity is obvious and manifest. For this reason it is forbidden for a man to point at his Muslim brother with an iron instrument, for Shaytan may cause him to strike him with it.
Imam Ahmad recorded that Abu Hurayrah said:
""The Messenger of Allah said:
لَاا يُشِيرَنَّ أَحَدُكُمۡ إِلَى أَخِيهِ بِالسِّلَاحِ فَإِنَّهُ لَاا يَدۡرِي أَحَدُكُمۡ لَعَلَّ الشَّيۡطَانَ أَنۡ يَنۡزِعَ فِي يَدِهِ فَيَقَعَ فِي حُفۡرَةٍ مِنَ النَّار
No one of you should point at his brother with a weapon, for he does not know whether Shaytan will cause him to strike him with it and thus be thrown into a pit of Fire.
Al-Bukhari and Muslim recorded this Hadith with the chain of narration from Abdur-Razzaq
Allah says:
رَّبُّكُمۡ أَعۡلَمُ بِكُمۡ
Your Lord knows you best;
O mankind, meaning, He knows best who among you deserves to be guided and who does not deserve to be guided.
إِن يَشَأۡ يَرۡحَمۡكُمۡ
if He wills, He will have mercy on you,
by helping you to obey Him and turn to Him.
أَوۡ إِن يَشَأۡ يُعَذِّبۡكُمۡ وَمَا أَرۡسَلۡنَاكَ
or if He wills, He will punish you. And We have not sent you (- O Muhammad -).
عَلَيۡهِمۡ وَكِيلً
as a guardian over them.
meaning, `We have sent you as a warner, so whoever obeys you, will enter Paradise and whoever disobeys you, will enter Hell.
وَرَبُّكَ أَعۡلَمُ بِمَن فِي السَّمَاوَاتِ وَالَارۡضِ
And your Lord knows best all who are in the heavens and the earth.
meaning, their status or level of obedience or disobedience.
The Preference of some Prophets above Others
Allah says:
وَلَقَدۡ فَضَّلۡنَا بَعۡضَ النَّبِيِّينَ عَلَى بَعۡضٍ
And indeed, We have preferred some of the Prophets above others.
As Allah says:
تِلۡكَ الرُّسُلُ فَضَّلۡنَا بَعۡضَهُمۡ عَلَى بَعۡضٍ مِّنۡهُمۡ مَّن كَلَّمَ اللَّهُ وَرَفَعَ بَعۡضَهُمۡ دَرَجَـتٍ
Those Messengers! We preferred some of them to others; to some of them Allah spoke (directly); others He raised to degrees (of honor). (2:253)
This does not contradict the report in the Two Sahihs which says that the Messenger of Allah said:
لَاا تُفَضِّلُوا بَيۡنَ الاۡاَنۡبِيَاء
Don't give superiority to any Prophet among (Allah's) Prophets.
What is meant in this Hadith is giving a superiority based on whims and fanaticism or sectarian feelings, not on the basis of evidence. If there is solid evidence, we have to follow it. There is no dispute that the Messengers are better than the rest of the Prophets, and that the mighty Messengers of Great Resolve are the best of all. They are the five mentioned in two Ayat of the Qur'an, in Surah Al-Ahzab:
وَإِذۡ أَخَذۡنَا مِنَ النَّبِيِّيۡنَ مِيثَاقَهُمۡ وَمِنۡكَ وَمِن نُّوحٍ وَإِبۡرَهِيمَ وَمُوسَى وَعِيسَى ابۡنِ مَرۡيَمَ
And (remember) when We took from the Prophets their covenant, and from you and from Nuh, Ibrahim, Musa and `Isa son of Maryam. (33:7)
and in Surah Ash-Shura:
شَرَعَ لَكُم مِّنَ الِدِينِ مَا وَصَّى بِهِ نُوحاً وَالَّذِى أَوۡحَيۡنَأ إِلَيۡكَ وَمَا وَصَّيۡنَا بِهِ إِبۡرَاهِيمَ وَمُوسَى وَعِيسَى أَنۡ أَقِيمُواۡ الدِّينَ وَلَا تَتَفَرَّقُواۡ فِيهِ
He has ordained for you the same religion which He ordained for Nuh, and that which We have revealed to you, and that which We ordained for Ibrahim, Musa and `Isa saying you should establish religion and make no divisions in it. (42:13)
There is no dispute that Muhammad is the best of them, then Ibrahim, then Musa, then `Isa (peace be upon them all), according to the best-known view.
We have discussed the evidence for this in detail elsewhere, and Allah is the source of help.
Allah's saying,
وَاتَيۡنَا دَاوُودَ زَبُورًا
and to Dawud We gave the Zabur.
is an indication of his virtue and honor.
Al-Bukhari recorded from Abu Hurayrah that the Prophet said:
خُفِّفَ عَلَى دَاوُدَ الۡقُرۡانُ فَكَانَ يَأۡمُرُ بِدَوَابِّهِ فَتُسۡرَجُ فَكَانَ يَقۡرَوُهُ قَبۡلَ أَنۡ يَفۡرُغ
The Qur'an (i.e. revealed Scripture of Zabur) was made easy for Dawud, so he would call for his mounts to be saddled, and he would finish reciting it (i.e., the Zabur) before the job was done."
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