The Kneeling
ثُمَّ جَعَلْنَـٰكَ عَلَىٰ شَرِيعَةٍ مِّنَ ٱلْأَمْرِ فَٱتَّبِعْهَا وَلَا تَتَّبِعْ أَهْوَآءَ ٱلَّذِينَ لَا يَعْلَمُونَ
Then We put you, [O Muhammad], on an ordained way concerning the matter [of religion]; so follow it and do not follow the inclinations of those who do not know.
Nearby ayahs help place verse 45:18 in sequence and meaning.
وَلَقَدْ ءَاتَيْنَا بَنِىٓ إِسْرَٰٓءِيلَ ٱلْكِتَـٰبَ وَٱلْحُكْمَ وَٱلنُّبُوَّةَ وَرَزَقْنَـٰهُم مِّنَ ٱلطَّيِّبَـٰتِ وَفَضَّلْنَـٰهُمْ عَلَى ٱلْعَـٰلَمِينَ
And We did certainly give the Children of Israel the Scripture and judgement and prophethood, and We provided them with good things and preferred them over the worlds.
وَءَاتَيْنَـٰهُم بَيِّنَـٰتٍ مِّنَ ٱلْأَمْرِ ۖ فَمَا ٱخْتَلَفُوٓا۟ إِلَّا مِنۢ بَعْدِ مَا جَآءَهُمُ ٱلْعِلْمُ بَغْيًۢا بَيْنَهُمْ ۚ إِنَّ رَبَّكَ يَقْضِى بَيْنَهُمْ يَوْمَ ٱلْقِيَـٰمَةِ فِيمَا كَانُوا۟ فِيهِ يَخْتَلِفُونَ
And We gave them clear proofs of the matter [of religion]. And they did not differ except after knowledge had come to them - out of jealous animosity between themselves. Indeed, your Lord will judge between them on the Day of Resurrection concerning that over which they used to differ.
إِنَّهُمْ لَن يُغْنُوا۟ عَنكَ مِنَ ٱللَّهِ شَيْـًٔا ۚ وَإِنَّ ٱلظَّـٰلِمِينَ بَعْضُهُمْ أَوْلِيَآءُ بَعْضٍ ۖ وَٱللَّهُ وَلِىُّ ٱلْمُتَّقِينَ
Indeed, they will never avail you against Allah at all. And indeed, the wrongdoers are allies of one another; but Allah is the protector of the righteous.
هَـٰذَا بَصَـٰٓئِرُ لِلنَّاسِ وَهُدًى وَرَحْمَةٌ لِّقَوْمٍ يُوقِنُونَ
This [Qur'an] is enlightenment for mankind and guidance and mercy for a people who are certain [in faith].