To make the Heart Tender (Ar-Riqaq)
Ṣaḥīḥ al-Bukhārī 6579
حَوْضِي مَسِيرَةُ شَهْرٍ، مَاؤُهُ أَبْيَضُ مِنَ اللَّبَنِ، وَرِيحُهُ أَطْيَبُ مِنَ الْمِسْكِ، وَكِيزَانُهُ كَنُجُومِ السَّمَاءِ، مَنْ شَرِبَ مِنْهَا فَلاَ يَظْمَأُ أَبَدًا
ḥawḍī masīrah shahrin, māʾuhu abyaḍu mina al-labani, warīḥuhu aṭyabu mina al-miski, wakīzānuhu kanujūmi as-samāʾi, man shariba minhā falā yaẓmaʾu abadan
Transliteration generated from the Arabic vowel marks
The full narration
Narrated `Abdullah bin `Amr:The Prophet (ﷺ) said, "My Lake-Fount is (so large that it takes) a month's journey to cross it. Its water is whiter than milk, and its smell is nicer than musk (a kind of Perfume), and its drinking cups are (as numerous) as the (number of) stars of the sky; and whoever drinks from it, will never be thirsty
Source
Ṣaḥīḥ al-Bukhārī · 6579