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وَلَا تَدْعُ مَعَ ٱللَّهِ إِلَـٰهًا ءَاخَرَ ۘ لَآ إِلَـٰهَ إِلَّا هُوَ ۚ كُلُّ شَىْءٍ هَالِكٌ إِلَّا وَجْهَهُۥ ۚ لَهُ ٱلْحُكْمُ وَإِلَيْهِ تُرْجَعُونَ
And do not invoke with Allah another deity. There is no deity except Him. Everything will be destroyed except His Face. His is the judgement, and to Him you will be returned.
Nearby ayahs help place verse 28:88 in sequence and meaning.
وَمَا كُنتَ تَرْجُوٓا۟ أَن يُلْقَىٰٓ إِلَيْكَ ٱلْكِتَـٰبُ إِلَّا رَحْمَةً مِّن رَّبِّكَ ۖ فَلَا تَكُونَنَّ ظَهِيرًا لِّلْكَـٰفِرِينَ
And you were not expecting that the Book would be conveyed to you, but [it is] a mercy from your Lord. So do not be an assistant to the disbelievers.
وَلَا يَصُدُّنَّكَ عَنْ ءَايَـٰتِ ٱللَّهِ بَعْدَ إِذْ أُنزِلَتْ إِلَيْكَ ۖ وَٱدْعُ إِلَىٰ رَبِّكَ ۖ وَلَا تَكُونَنَّ مِنَ ٱلْمُشْرِكِينَ
And never let them avert you from the verses of Allah after they have been revealed to you. And invite [people] to your Lord. And never be of those who associate others with Allah.