Quran 7:194 from Surah Al-A'raaf on Divine Marvels.
إِنَّ ٱلَّذِينَ تَدۡعُونَ مِن دُونِ ٱللَّهِ عِبَادٌ أَمۡثَالُكُمۡۖ فَٱدۡعُوهُمۡ فَلۡيَسۡتَجِيبُواْ لَكُمۡ إِن كُنتُمۡ صَٰدِقِينَ
English translation: Indeed those whom you call from besides Allah (are) slaves like you So invoke them and let them respond to you if you are truthful
Transliteration: inna alladhina tad'una min duni al-lahi ibadun amthalukum fa-id'uhum falyastajibu lakum in kuntum sadiqina