(إِلَّا الَّذِينَ ظَلَمُوا مِنْهُمْ) (except for those of them who commit wrong): In other words, they are excessive in exceeding the command of Allah (swt).

(فَلَا تَخْشَوْهُمْ) )so fear them not but fear Me(: Allah (swt) commands us to fear Him and not His creation. You are between the creatures and the Creator, The Prophet (saws) said on behalf of his Lord:

“By My Might, I don’t combine on My servant two fears”[1].

Two fears cannot be combined in the heart. Either you fear Allah (swt), because you know that all your affairs are in His hand, He alone is the Harmful and the Beneficial, He is the One Who gives life and the One Who causes death, the Giver and the Inhibitor, to whom all things will return, and the reins of the heavens and the earth are in His hands. Therefore, when Moses sensed within himself apprehension, Allah (swt) said to him:

{قُلْنَا لَا تَخَفْ إِنَّكَ أَنتَ الْأَعْلَىٰ}

(Allah said, “Fear not. Indeed, it is you who are superior) (Taha: 68)

So fear them not but fear Me, and He addressed the believers by saying:

{إِنَّمَا ذَٰلِكُمُ الشَّيْطَانُ يُخَوِّفُ أَوْلِيَاءَهُ فَلَا تَخَافُوهُمْ وَخَافُونِ إِن كُنتُم مُّؤْمِنِينَ}

(That is only Satan who frightens [you] of his supporters. So fear them not, but fear Me, if you are [indeed] believers) (Al-Imran: 175)

(ولِأُتِمَّ نِعْمَتِي عَلَيْكُمْ)  (And [it is] so I may complete My favor upon you): completing the favor from Allah (swt) has been by Islam and the revelation of the Qur’an, because Allah (swt) says:

 {الْيَوْمَ أَكْمَلْتُ لَكُمْ دِينَكُمْ وَأَتْمَمْتُ عَلَيْكُمْ نِعْمَتِي وَرَضِيتُ لَكُمُ الْإِسْلَامَ دِينًا }

This day I have perfected for you your religion and completed My favor upon you and have approved for you Islam as religion. (Al-Maeda: 3)

[1] Shu‘abu Al-Imᾱn, the eleventh, section of fearing from Allah, no. 777.