كتاب الآداب
38  
The Book of Manners and Etiquette
(6)
Chapter: It Is Permissible To Say: "O My Son" To Someone Other Than One's Son, And It Is Recommended To Speak Kindly
(6)
باب جَوَازِ قَوْلِهِ لِغَيْرِ ابْنِهِ يَا بُنَىَّ وَاسْتِحْبَابِهِ لِلْمُلاَطَفَةِ ‏‏
Sahih Muslim 2152 a

Mughira b. Shu'ba reported that none else had asked more questions from Allah's Messenger (ﷺ) about the Dajjal than I, but he simply said in a slight mood):

O, myson, why are you worried because of him? He will not harm you. I said: The people think that he would have with him rivers of water and mountains of bread, whereupon he said: He would be more insignificant in the sight of Allah than all these things (belonging to him).
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، وَابْنُ أَبِي عُمَرَ، - وَاللَّفْظُ لاِبْنِ أَبِي عُمَرَ - قَالاَ حَدَّثَنَا يَزِيدُ بْنُ هَارُونَ، عَنْ إِسْمَاعِيلَ بْنِ أَبِي خَالِدٍ، عَنْ قَيْسِ بْنِ أَبِي حَازِمٍ، عَنِ الْمُغِيرَةِ، بْنِ شُعْبَةَ قَالَ مَا سَأَلَ رَسُولَ اللَّهِ صلى الله عليه وسلم أَحَدٌ عَنِ الدَّجَّالِ أَكْثَرَ مِمَّا سَأَلْتُهُ عَنْهُ فَقَالَ لِي ‏"‏ أَىْ بُنَىَّ وَمَا يُنْصِبُكَ مِنْهُ إِنَّهُ لَنْ يَضُرَّكَ ‏"‏ ‏.‏ قَالَ قُلْتُ إِنَّهُمْ يَزْعُمُونَ أَنَّ مَعَهُ أَنْهَارَ الْمَاءِ وَجِبَالَ الْخُبْزِ ‏.‏ قَالَ ‏"‏ هُوَ أَهْوَنُ عَلَى اللَّهِ مِنْ ذَلِكَ ‏"‏ ‏.‏
Reference : Sahih Muslim 2152a
In-book reference : Book 38, Hadith 39
USC-MSA web (English) reference : Book 25, Hadith 5352
  (deprecated numbering scheme)