In The Name of Allah, The Most Merciful, The Bestower of Mercy.

Allah, The Most High, said:

وَقُل لِّعِبَادِى يَقُولُوا۟ ٱلَّتِى هِىَ أَحْسَنُ إِنَّ ٱلشَّيْطَٰنَ يَنزَغُ بَيْنَهُمْ إِنَّ ٱلشَّيْطَٰنَ كَانَ لِلْإِنسَٰنِ عَدُوًّا مُّبِينًا

And say to My slaves (i.e. the true believers of Islamic Monotheism) that they should (only) say those words that are the best. (Because) shaitan (Satan) verily, sows disagreements among them. Surely, shaitan (Satan) is to man a plain enemy.

And this is from His benevolence to His servants as He commanded them with the best of manners, deeds, and statements that would surely lead to happiness in this Dunya and the Hereafter. He said: [وَقُلْ لِعِبَادِي يَقُولُوا الَّتِي هِيَ أَحْسَنُ – And say to My slaves (i.e. the true believers of Islamic Monotheism) that they should (only) say those words that are the best]. This is a command to utter every speech that would draws a person closer to Allah, such as (Qur’an) recitation, remembrance (of Allah), knowledge, enjoining good and forbidding evil, good and benevolent speech towards the creation in accordance with different ranks and positions. And when a matter involves choosing between two good things, then indeed, He commands that the better of the two be given precedence if the two cannot be combined. Good speech urges towards every beautiful character and righteous deed, for indeed the one who controls his tongue gains control of all his affairs.

And his statement: [إِنَّ الشَّيْطَانَ يَنْزَغُ بَيْنَهُمْ – (Because) shaitan (Satan) verily, sows disagreements among them]. Meaning, he strives among people to corrupt their religion and worldly affairs. So, the remedy for this is that indeed they should not obey him with regards to speech that is not good which he calls to, and that they employ gentleness among themselves in order to subdue shaitan who sows enmity between them, for indeed he is their true (or real) enemy regarding whom they are obligated to fight because he calls them only “to be among the dwellers of the blazing fire.

As for their brothers, even if Satan sows enmity between them and strives to stir up enmity, then indeed, (there should be) absolute resolve (or determination) in striving against their enemy and subdue their souls that command evil by way of which which shaitan finds his way in. Thus, by way of this, they obey their Lord, their affairs become upright, and they are guided due to their upright conduct.

An excerpt from Tafsir As-Sadi.

To be continued InShaAllah