Quran 6:137 from Surah Al-An'aam on Divine Marvels.
وَكَذَٰلِكَ زَيَّنَ لِكَثِيرٖ مِّنَ ٱلۡمُشۡرِكِينَ قَتۡلَ أَوۡلَٰدِهِمۡ شُرَكَآؤُهُمۡ لِيُرۡدُوهُمۡ وَلِيَلۡبِسُواْ عَلَيۡهِمۡ دِينَهُمۡۖ وَلَوۡ شَآءَ ٱللَّهُ مَا فَعَلُوهُۖ فَذَرۡهُمۡ وَمَا يَفۡتَرُونَ
English translation: And likewise made pleasing to many of the polytheists (the) killing (of) their children their partners so that they may ruin them and that they make confusing to them their religion And if (had) willed Allah not (would) they have done so So leave them and what they invent
Transliteration: wakadhalika zayyana likathirin mina al-mush'rikina qatla awladihim shurakauhum liyur'duhum waliyalbisu alayhim dinahum walaw shaa al-lahu ma fa'aluhu fadharhum wama yaftaruna