Ayah

Word by Word
فَٱسۡتَقِمۡ
So stand firm
كَمَآ
as
أُمِرۡتَ
you are commanded
وَمَن
and (those) who
تَابَ
turn (in repentance)
مَعَكَ
with you
وَلَا
and (do) not
تَطۡغَوۡاْۚ
transgress
إِنَّهُۥ
Indeed He
بِمَا
of what
تَعۡمَلُونَ
you do
بَصِيرٞ
(is) All-Seer
فَٱسۡتَقِمۡ
So stand firm
كَمَآ
as
أُمِرۡتَ
you are commanded
وَمَن
and (those) who
تَابَ
turn (in repentance)
مَعَكَ
with you
وَلَا
and (do) not
تَطۡغَوۡاْۚ
transgress
إِنَّهُۥ
Indeed He
بِمَا
of what
تَعۡمَلُونَ
you do
بَصِيرٞ
(is) All-Seer
Translation

Therefore stand firm (in the straight Path) as thou art commanded,- thou and those who with thee turn (unto Allah); and transgress not (from the Path): for He seeth well all that ye do.
Tafsir

So remain upright, acting in accordance with the commandment of your Lord and supplicating Him, as you have been commanded, and, let him also remain upright, he who repents, [who] believes, with you; and do not transgress, [do not] overstep the bounds of God. Truly He sees what you do, and will requite you for it.
"The Command to Stand Firm and Straight
Allah says;
فَاسۡتَقِمۡ كَمَا أُمِرۡتَ وَمَن تَابَ مَعَكَ وَلَا تَطۡغَوۡاۡ
So stand (ask Allah to make) you firm and straight as you are commanded and those who turn in repentance with you, and transgress not.
Allah, the Exalted, commands His Messenger and His believing servants to be firm and to always be upright. This is of the greatest aid for gaining victory over the enemy and confronting the opposition.
Allah also forbids transgression, which is to exceed the bounds (of what is allowed). Verily, transgression causes destruction to its practitioner, even if the transgression was directed against a polytheist.
إِنَّهُ بِمَا تَعۡمَلُونَ بَصِيرٌ
Verily, He is All-Seer of what you do.
Allah informs that He is All-Seer of the actions of His servants. He is not unaware of anything and nothing is hidden from Him.
Concerning Allah's statement
وَلَا تَرۡكَنُواۡ إِلَى الَّذِينَ ظَلَمُواۡ
And incline not toward those who do wrong,
Ali bin Abi Talhah said that Ibn Abbas said,
""Do not compromise with them.""
Ibn Jarir said that Ibn Abbas said,
""Do not side with those who do wrong.""
This is a good statement. This means,
""Do not seek assistance from wrongdoers, because it will be as if you are condoning their actions (of evil).""
فَتَمَسَّكُمُ النَّارُ
وَمَا لَكُم مِّن دُونِ اللّهِ مِنۡ أَوۡلِيَاء ثُمَّ لَا تُنصَرُونَ
lest the Fire should touch you, and you have no protectors other than Allah, nor you would then be helped.
This means that you will not have besides Allah any friend who can save you, nor any helper who can remove you from His torment."
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