Allāh is the one who created you, then provided for you, then will cause you to die, and then will give you life. Are there any of your "partners" who does anything of that? Exalted is He and high above what they associate with Him.
وَمَا آتَيْتُم مِّن رِّبًا لِّيَرْبُوَ فِي أَمْوَالِ النَّاسِ (And whatever Riba [ increased amount ] you give so that it may increase in the wealth of the people, - 30:39). This verse is meant to correct an evil custom which is common in close relatives and the families at large. When people extend a gift or a present to relatives, especially at the time of marriages, they make a note of the amount they have given, in the hope that they will get back an equal amount in return when it is their turn, rather a little more. This custom is known in Urdu as 'neota'. It is emphasized in this verse that the instruction given in the preceding verse about the rights of relatives should be implemented in a manner that neither it be shown as a favour, nor should it be given in the hope of any return. Whoever gives out money in the hope that it will bring back something more, then it is not worthy of reward in the sight of Allah. Qur'an has referred to it as riba, alluding that it is as bad as usury or interest.1
If human beings adopt the one God as their object of worship, then everyone’s centre of attention is one. This creates an atmosphere of unity among human beings. On the contrary, if numerous entities are made objects of worship, and people individually worship different things, their attention becomes divided. Because of this, differences amounting to enmity develop between individuals and nations. The land, the sea and the atmosphere become fraught with discord. The end result of man’s wrongdoing will appear after death. But the temporary result of man’s wrongdoing is shown in this world for the time being, purely to serve as an admonishment and a warning.
Uthmani text of the Madinah mushaf (King Fahd Complex). Translation: Saheeh International. Tafsir via Quran.com.