Sahih Muslim
135.01

It is narrated on the authority of Abu Huraira that the Messenger of Allah (ﷺ) observed:People will constantly ask you questions pertaining to knowledge till they would say: Allah created us, but who created Allah? he (the narrator) says: he (Abu Huraira) was (at the time of narrating this hadith) catching hold of the hand of a man and he said: Allah and the Messenger told the truth. Two persons have already put me this question, and this is the third one, or he said: One man has put me this question and he is the second one

135.02

It is narrated on the authority of Abu Huraira that he said:The people will constantly, and the rest of the hadith is the same as that transmitted by 'Abdul-Warith with the exception that there is no mention of the Messenger of Allah in that, but he observed at the end of the hadith: Allah and His Messenger told the truth

135.03

Abu Huraira reported:The Messenger of Allah (ﷺ) said to me: they (the people) till constantly ask you, Abu Huraira, (about different things pertaining to religion) the they would say: Well, there is Allah, but after all who created Allah? He (Abu Huraira) narrated: Once we were in the mosque that some of the Bedouins came there and said: Well, there is Allah, but who created Allah? He (the narrator) said: I took hold of the pebbles in my fist and flung at them and remarked: Stand up, stand up (go away) my friend (the Holy Prophet) told the truth

135.04

Yazid b. al-Asamm said:I heard Abu Huraira saying that the Messenger of Allah (ﷺ) observed: people will certainly ask you about everything till they will propound: Allah created every thing, but who created Allah?