39:65
Az-Zumar 65
Surah Az-Zumar (الزمر), verse 65 — reference 39:65. Arabic text with optional translation and free audio on Al-Qalam.
وَلَقَدْ أُوحِىَ إِلَيْكَ وَإِلَى ٱلَّذِينَ مِن قَبْلِكَ لَئِنْ أَشْرَكْتَ لَيَحْبَطَنَّ عَمَلُكَ وَلَتَكُونَنَّ مِنَ ٱلْخَـٰسِرِينَ
walaqad ūḥiya ilayka wa-ilā alladhīna min qablika la-in ashrakta layaḥbaṭanna ʿamaluka walatakūnanna mina l-khāsirīna
And it was already revealed to you and to those before you that if you should associate [anything] with Allāh, your work would surely become worthless, and you would surely be among the losers.