Abu Hurairah (May Allah be pleased with him) said:
The Messenger of Allah (ﷺ) said, "Almighty Allah says, 'I am the One Who is most free from want of partners. He who does a thing for the sake of someone else beside Me, I discard him and his polytheism.."[Muslim]. (DE)
App reference (DE): Book 18, Hadith 106 (DE)
Arabic/English book reference (DE): Book 18, Hadith 1616 (DE)