5:55
إِنَّمَا وَلِيُّكُمُ ٱللَّهُ وَرَسُولُهُۥ وَٱلَّذِينَ ءَامَنُوا۟ ٱلَّذِينَ يُقِيمُونَ ٱلصَّلَوٰةَ وَيُؤْتُونَ ٱلزَّكَوٰةَ وَهُمْ رَٰكِعُونَ
Your ally is none but Allah and [therefore] His Messenger and those who have believed - those who establish prayer and give zakah, and they bow [in worship].
Translation · Saheeh International
Tafsir
Ibn Kathīr (abridged)
Threatening to Replace the Believers With Another People if They Revert from Islam
Allah emphasizes His mighty ability and states that whoever reverts from supporting His religion and establishing His Law, then Allah will replace them with whomever is better, mightier and more righteous in Allah's religion and Law. Allah said in other Ayat,
الْفُقَرَآءُ وَإِن تَتَوَلَّوْاْ يَسْتَبْدِلْ قَوْماً غَيْرَكُمْ ثُمَّ لاَ يَكُونُواْ
(And if you turn away, He will exchange you for some other people and they will not be your likes.) and,
أَلَمْ تَرَ أَنَّ اللَّهَ خَلَقَ السَّمَـوَتِ وَالأَرْضَ بِالْحقِّ إِن يَشَأْ يُذْهِبْكُمْ وَيَأْتِ بِخَلْقٍ جَدِيدٍ - وَمَا ذَلِكَ عَلَى اللَّهِ بِعَزِيزٍ
(Do you not see that Allah has created the heavens and the earth with truth If He will, He can remove you and bring (in your place) a new creation! And for Allah that is not hard or difficult.)14:19-20. Verily this is not difficult or hard on Allah. Allah said here,