Messenger of Allah ﷺ said, "Satan comes to one of you and says, 'Who created so-and-so? 'till he says, 'Who has created your Lord?' So, when he inspires such a question, one should seek refuge with Allah and give up such thoughts."  

قَالَ رَسُولُ اللَّهِ ﷺ يَأْتِي الشَّيْطَانُ أَحَدَكُمْ فَيَقُولُ مَنْ خَلَقَ كَذَا مَنْ خَلَقَ كَذَا حَتَّى يَقُولَ مَنْ خَلَقَ رَبَّكَ فَإِذَا بَلَغَهُ فَلْيَسْتَعِذْ بِاللَّهِ وَلْيَنْتَهِ  

Messenger of Allah ﷺ said, "People will not stop asking questions till they say, 'This is Allah, the Creator of everything, then who created Allah?' "  

قَالَ رَسُولُ اللَّهِ ﷺ لَنْ يَبْرَحَ النَّاسُ يَتَسَاءَلُونَ حَتَّى يَقُولُوا هَذَا اللَّهُ خَالِقُ كُلِّ شَىْءٍ فَمَنْ خَلَقَ اللَّهَ