Surah Az-Zumar (The Successive Groups), Verse 65

وَلَقَدْ اُوْحِیَ اِلَیْكَ وَاِلَی الَّذِیْنَ مِنْ قَبْلِكَ لَىِٕنْ اَشْرَكْتَ لَیَحْبَطَنَّ عَمَلُكَ وَلَتَكُوْنَنَّ مِنَ الْخٰسِرِیْنَ ۟

Wa laqad oohiya ilaika wa ilal lazeena min qablika la in ashrakta la yahbatanna 'amalu ka wa latakoonanna minal khaasireen

“But it has already been revealed to thee,- as it was to those before thee,- "If thou wert to join (gods with Allah), truly fruitless will be thy work (in life), and thou wilt surely be in the ranks of those who lose (all spiritual good)".”

Quran 39:65 (Yusuf Ali Translation)