Arabic text
عَن أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ: قَالَ رَسُولُ اللَّهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ: «يَأْتِي الشَّيْطَانُ أَحَدَكُمْ فَيَقُولُ: مَنْ خَلَقَ كَذَا؟ مَنْ خَلَقَ كَذَا؟ حَتَّى يَقُولَ: مَنْ خَلَقَ رَبَّكَ؟ فَإِذَا بَلَغَهُ فَلْيَسْتَعِذْ بِاللهِ وَلْيَنْتَهِ».
Translation
Abu Hurayrah (may Allah be pleased with him) reported: The Messenger of Allah (may Allah's peace and blessings be upon him) said: "Satan comes to one of you and says, 'Who created such and such, and who created such and such', until he says: 'Who created your Lord?' If a person experiences this, he should seek refuge with Allah and desist from that."
Explanation
The Messenger of Allah (may Allah’s peace and blessings be upon him) mentions the effective remedy for the questions whispered by Satan to the believer. Satan says: Who created such and such, and who created such and such? Who created the heavens? Who created the earth? Based on his religion, natural disposition, and reason, the believer replies: Allah. But Satan does not stop at this limit of whisperings; rather, he proceeds until he asks: Who created your Lord? Thereupon, the believer should repel these whisperings with three things: Belief in Allah. Seeking refuge with Allah from Satan. Stopping to continue with such whisperings.
Source: HadeethEnc.com