كتاب الحج
15  
The Book of Pilgrimage
(85)
Chapter: The virtue of Al-Madinah and the Prophet's Prayer for it to be blessed. Its sanctity and the sanctity of its game and trees. The Boundaries of its sanctuary
(85)
باب فَضْلِ الْمَدِينَةِ وَدُعَاءِ النَّبِيِّ صلى الله عليه وسلم فِيهَا بِالْبَرَكَةِ وَبَيَانِ تَحْرِيمِها وَتَحْرِيمِ صَيْدِهَا وَشَجَرِهَا وَبَيَانِ حُدُودِ حَرَمِهَا
Sahih Muslim 1373 b

Abu Huraira (Allah be pleased with him) reported that Allah's Messenger (ﷺ) was given the first fruit and he said:

O Allah, shower blessings upon us in our city, and in our fruits, in our mudd and in our sa's, blessings upon blessings, and he would then give that to the youngest of the children present there.
حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، أَخْبَرَنَا عَبْدُ الْعَزِيزِ بْنُ مُحَمَّدٍ الْمَدَنِيُّ، عَنْ سُهَيْلِ بْنِ أَبِي، صَالِحٍ عَنْ أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ يُؤْتَى بِأَوَّلِ الثَّمَرِ فَيَقُولُ ‏ "‏ اللَّهُمَّ بَارِكْ لَنَا فِي مَدِينَتِنَا وَفِي ثِمَارِنَا وَفِي مُدِّنَا وَفِي صَاعِنَا بَرَكَةً مَعَ بَرَكَةٍ ‏"‏ ‏.‏ ثُمَّ يُعْطِيهِ أَصْغَرَ مَنْ يَحْضُرُهُ مِنَ الْوِلْدَانِ ‏.‏
Reference : Sahih Muslim 1373 b
In-book reference : Book 15, Hadith 539
USC-MSA web (English) reference : Book 7, Hadith 3171
  (deprecated numbering scheme)